{"id":36410,"date":"2022-01-05T18:13:03","date_gmt":"2022-01-05T12:43:03","guid":{"rendered":"https:\/\/mcq-questions.com\/?p=36410"},"modified":"2022-01-11T09:29:04","modified_gmt":"2022-01-11T03:59:04","slug":"mcq-questions-for-class-10-science-chapter-6","status":"publish","type":"post","link":"https:\/\/mcq-questions.com\/mcq-questions-for-class-10-science-chapter-6\/","title":{"rendered":"MCQ Questions for Class 10 Science Chapter 6 Life Processes"},"content":{"rendered":"
Question 1.<\/p>\n
(A) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll.
\n(B) They store carbohydrates in the form of starch.
\n(C) They convert carbon dioxide and water into carbohydrates in the absence of sunlight.
\n(D) They constitute the first trophic level in food chains
\nAnswer:
\n(C) They convert carbon dioxide and water into carbohydrates in the absence of sunlight.<\/p>\n
Explanation:
\nAutotrophs take in food from the outside world and convert them into stored forms of energy. This material is taken in the form of carbon dioxide and water which is converted into carbohydrates in the presence of sunlight and chlorophyll.<\/p>\n
<\/p>\n
Question 2.<\/p>\n
(A) Mushroom, green plants, Amoeba
\n(B) Yeast, mushroom, bread mould
\n(C) Paramecium, Amoeba, Cuscuta
\n(D) Cuscuta, lice, tapeworm W
\nAnswer:
\n(B) Yeast, mushroom, bread mould<\/p>\n
Explanation:
\nThese are saprotrophs and digestion in saprotrophs take place before ingestion. They break down and convert complex organic molecules present in dead and decaying matter into simpler substances outside their body.<\/p>\n
Question 3.<\/p>\n
(A) Mouth \u2192 stomach \u2192 small intestine \u2192 oesophagus \u2192 large intestine
\n(B) Mouth \u2192 oesophagus \u2192 stomach \u2192 large intestine \u2192 small intestine
\n(C) Mouth \u2192 stomach \u2192 oesophagus \u2192 small intestine \u2192 large intestine
\n(D) Mouth \u2192 oesophagus \u2192 stomach \u2192 small intestine \u2192 large intestine
\nAnswer:
\n(D) Mouth \u2192 oesophagus \u2192 stomach \u2192 small intestine \u2192 large intestine<\/p>\n
Explanation:
\nThe sequence of organs in human alimentary canal are: Mouth, oesophagus, stomach, small intestine, large intestine and anus.<\/p>\n
<\/p>\n
Question 4.<\/p>\n
(A) Proteins breaking down into amino acids
\n(B) Starch breaking down into sugars
\n(C) Fats breaking down into fatty acids and glycerol
\n(D) Absorption of vitamins
\nAnswer:
\n(B) Starch breaking down into sugars<\/p>\n
Explanation:
\nIf salivary amylase is lacking in the saliva, the process of starch digestion will get disturb as salivary amylase helps in digestion of starch.<\/p>\n
Question 5.<\/p>\n
(A) Heterotrophs do not synthesise their own food.
\n(B) Heterotrophs utilise solar energy for photosynthesis.
\n(C) Heterotrophs synthesise their own food.
\n(D) Heterotrophs are capable of converting carbon dioxide and water into carbohydrates.
\nAnswer:
\n(A) Heterotrophs do not synthesise their own food.<\/p>\n
Explanation: Question 6.<\/p>\n (A) carbon dioxide and water Explanation: Question 7.<\/p>\n (A) Pepsin Explanation: <\/p>\n Question 8.<\/p>\n (A) complex proteins Explanation: Question 9.<\/p>\n (A) cytoplasm Explanation: Question 10. Explanation: Question 11.<\/p>\n (i) Pyruvate can be converted into ethanol and carbon dioxide by yeast. (A) (i) and (iii) Explanation: <\/p>\n Question 12.<\/p>\n (A) cytoplasm Explanation: Question 13.<\/p>\n (A) Only carbon dioxide + water + energy Explanation: Question 14.<\/p>\n (A) Out body needs more oxygen. Explanation: <\/p>\n Question 15.<\/p>\n (A) They form a very large surface area. Explanation: Question 16.<\/p>\n (A) Filtered in the nostrils Explanation: Question 17.<\/p>\n (A) Valves in heart Explanation: <\/p>\n Question 18.<\/p>\n (A) Labeo, Chameleon, Salamander Explanation: Question 19.<\/p>\n (A) carbon dioxide Explanation: Question 20.<\/p>\n (A) transport of water Explanation: <\/p>\n Question 21.<\/p>\n (i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs. (A) (i) Explanation: Question 22.<\/p>\n (A) Pisces and amphibians Explanation: Question 23.<\/p>\n (A) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart. Explanation: Question 24.<\/p>\n (A) It helps in transportation of respiratory gases. Explanation: <\/p>\n Question 25.<\/p>\n (A) ureter Explanation: Question 26.<\/p>\n (A) nutrition Explanation: Question 27.<\/p>\n (A) A – (ii), B – (i), C – (iv), D – (iii) Question 28.<\/p>\n (A) Neuron Explanation: <\/p>\n Question 29.<\/p>\n (A) kidney \u2192 ureter \u2192 urethra \u2192 urinary bladder Explanation: Question 30.<\/p>\n (A) Water Explanation: Question 31.<\/p>\n (A) Bowman’s capsule, Ampulla Explanation: Question 32.<\/p>\n (A) Ventilator Explanation: <\/p>\n Assertion and Reason Based MCQs\u00a0<\/span><\/p>\n Directions : In the following questions, A statement of Assertion (A) is followed by a statement of Reason (R). Mark the correct choice as: Question 1.<\/p>\n Answer: Explanation: Question 2.<\/p>\n Answer: Explanation: Question 3.<\/p>\n Answer: Explanation: <\/p>\n Question 4.<\/p>\n Answer: Explanation: Question 5.<\/p>\n Answer: Explanation: Question 6.<\/p>\n Answer: Explanation: Question 7.<\/p>\n Answer: Explanation: <\/p>\n Question 8.<\/p>\n Answer: Explanation: Question 9.<\/p>\n Answer: Explanation: Question 10.<\/p>\n Answer: Explanation: Question 11.<\/p>\n Answer: Explanation: <\/p>\n Question 12.<\/p>\n Answer: Explanation: Question 13.<\/p>\n Answer: Explanation: Question 14.<\/p>\n Answer: Explanation: Question 15.<\/p>\n Answer: Explanation: <\/p>\n Question 15.<\/p>\n Answer: Explanation: Question 16.<\/p>\n Answer: Explanation: Case-Based MCQs<\/span><\/p>\n Attempt any 4 sub-parts from each question. Each sub-part carries 1 mark.<\/p>\n I. Read the given passage and answer any of the four questions from Question l. to Question 5. Question 1.<\/p>\n (A) To store bile Explanation: Question 2.<\/p>\n (A) affects the person’s health Explanation: <\/p>\n Question 3.<\/p>\n (A) It helps in emulsification of fat. Explanation: Question 4.<\/p>\n (A) Stomach Explanation: Question 5.<\/p>\n (A) Activator of lipase Explanation: II. The given diagram is of human digestive human. Study the diagram and answer any of the four questions from Question 1. to Question 5. Question 1.<\/p>\n (A) B- Oesophagus, C- Liver, D- Stomach, E- pancreas Explanation: Question 2.<\/p>\n (A) Bile Explanation: Question 3.<\/p>\n (A) Bile juice Explanation: Question 4.<\/p>\n (A) A Explanation: <\/p>\n Question 5.<\/p>\n (A) Absorption of food Explanation: III. Study the given flow chart and answer any of the four questions from Question l. to Question 5. Question 1.<\/p>\n (A) X-Glycolysis, Y-Anaerobic, Z-Aerobic Explanation: Question 2.<\/p>\n (A) Mitochondria and cytoplasm respectively Explanation: Question 3.<\/p>\n (A) Bacteria Explanation: Question 4.<\/p>\n (A) In muscle cells Explanation: <\/p>\n Question 5.<\/p>\n (A) Mitochondria Explanation: IV. Study the diagram of human respiratory system and answer any of the four questions Question 1. to Question 5. Question 1.<\/p>\n (A) Nephron Explanation: Question 2.<\/p>\n (A) P Explanation: Question 3.<\/p>\n (A)It is the secondary organ for respiration. Explanation: <\/p>\n Question 4.<\/p>\n (A) Bronchi Explanation: Question 5.<\/p>\n (A) Exchange of gases Explanation: V. The given diagram represents the structure of a human excretory system. Study the diagram and answer any of the four questions from Question 1. to Question 5.<\/p>\n <\/p>\n Question 1.<\/p>\n (A) Kidney Explanation: <\/p>\n Question 2.<\/p>\n (A) Alveoli Explanation: Question 3.<\/p>\n (A) Filtration Explanation: Question 4.<\/p>\n (A) Glucose Explanation: Question 5.<\/p>\n (A) kidney \u2192tureter \u2192 urethra \u2192 urinary bladder Explanation: VI. Read the given passage and answer any of the four questions from Question l. to Question 5.<\/p>\n Oxygen-rich blood from the lungs comes to the thin-walled upper chamber of the heart on the left. The left upper chamber (A) then relaxes. It then contracts and the blood is allowed to enter the next chamber (B), as it expands. When the muscular left lower chamber of heart contracts the blood is pumped out to the body via aorta.<\/p>\n Deoxygenated blood reaches from the body to the upper chamber on the right side of heart (C) and it expands. As this part contracts, the corresponding lower chamber (D) dilates. This transfers the blood to right ventricle, which in turn pumps it to the lungs for oxygenated.<\/p>\n <\/p>\n Question 1.<\/p>\n (A) A- Left atrium, B- Left Ventricle, C- Right atrium, D- Right ventricle Explanation: Question 2.<\/p>\n (A) A and B Explanation: Question 3.<\/p>\n (A) A \u2192 B \u2192 Lungs \u2192 C \u2192 D Explanation: Question 4.<\/p>\n (A) Valves in heart Explanation: Question 5.<\/p>\n (A) Both A and R are true and R is correct explanation of the assertion. Explanation: <\/p>\n VII. Read the passage and answer any of the four questions from Question l. to Question 5. Question 1.<\/p>\n (A) Expose the leaves to blue light for 48 hours before starting the experiment. Explanation: Question 2.<\/p>\n (A) Cobalt chloride paper Explanation: Question 3.<\/p>\n (A) Accumulation of more water. Explanation: <\/p>\n Question 4.<\/p>\n (A) Xylose Explanation: Question 5.<\/p>\n (A) P – Carbon dioxide, Q – Oxygen Explanation: Life Processes Class 10 MCQ Questions With Answers Question 1. Which of the following statements about the autotrophs is incorrect? (A) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll. (B) They store carbohydrates in the form of starch. (C) They convert carbon dioxide and water into carbohydrates in …<\/p>\n
\nHeterotrophs are organisms which cannot make their own food from inorganic substances like CO2<\/sub> and water as they do not have chlorophyll to trap solar energy. They depend on other organisms for their food. Autotrophs synthesize their own food through photosynthesis by utilizing solar energy, e.g., green plants.<\/p>\nThe autotrophic mode of nutrition requires<\/h2>\n
\n(B) chlorophyll
\n(C) sunlight
\n(D) all of these
\nAnswer:
\n(D) all of these<\/p>\n
\nThe autotrophic mode of nutrition requires carbon dioxide, water, chlorophyll and sunlight.<\/p>\nThe inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one.<\/h2>\n
\n(B) Mucus
\n(C) Salivary amylase
\n(D) Bile 5
\nAnswer:
\n(B) Mucus<\/p>\n
\nThe stomach has a lining of mucus cells. The mucus is secreted in the gastric juice by the glands present in the stomach wall. It helps to protect the wall of stomach from its own secretions of hydrochloric acid. If mucus is not secreted, HCl will cause the erosion of inner lining of stomach leading to ulcer formation.<\/p>\nA few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains<\/h2>\n
\n(B) simple proteins
\n(C) fats
\n(D) starch
\nAnswer:
\n(D) starch<\/p>\n
\nThe formation of blue-black colour of rice water confirms the presence of starch. Starch forms a dark blue complex with iodine. When iodine is added it will show no colour change in case of proteins or fats.<\/p>\nThe breakdown of pyruvate to give carbon dioxide, water and energy takes place in<\/h2>\n
\n(B) mitochondria
\n(C) chloroplast
\n(D) nucleus
\nAnswer:
\n(B) mitochondria<\/p>\n
\nThe breakdown of pyruvate to give carbon dioxide, water and energy takes place in mitochondria.<\/p>\n
\nThe correct sequence of anaerobic reactions in yeast is
\n
\nAnswer:
\n<\/p>\n
\nYeast is an unicellular eukaryote which carries out ethanol fermentation. In the first phase, glucose is converted into pyruvate (glycolysis) in the cytoplasm of the cell. Due to limited oxygen availability, pyruvate remains in cytoplasm where pyruvate decarboxylase and alcohol dehydrogenase enzymes carry out the second phase of anaerobic respiration and produce ethanol and carbon dioxide.<\/p>\nWhich of the following statement(s) is (are) correct?<\/h2>\n
\n(ii) Fermentation takes place in aerobic bacteria.
\n(iii) Fermentation takes place in mitochondria.
\n(iv) Fermentation is a form of anaerobic respiration.<\/p>\n
\n(B) (ii) and (iv)
\n(C) (i) and (iv)
\n(D) (ii) and (iii)
\nAnswer:
\n(C) (i) and (iv)<\/p>\n
\nYeast is a unicellular organism which brings out ethanol fermentation. The first stage is break down of one molecule of glucose into two molecules of pyruvate that occurs in cytoplasm. Because of limited oxygen availability, pyruvate remains in cytoplasm where pyruvate decarboxylase and alcohol dehydrogenase enzymes carry out the second phase of anaerobic respiration and produce ethanol and carbon dioxide.<\/p>\nDuring deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the<\/h2>\n
\n(B) chloroplast
\n(C) mitochondria
\n(D) golgi body
\nAnswer:
\n(A) cytoplasm<\/p>\n
\nLactic acid is formed after anaerobic respiration in muscle cells and this happens in cytoplasm.<\/p>\nWhich of the following completes the given equation? Glucose + Oxygen (?)<\/h2>\n
\n(B) Only carbon dioxide + water
\n(C) Only carbon dioxide
\n(D) Only water + energy
\nAnswer:
\n(A) Only carbon dioxide + water + energy<\/p>\n
\nThe given equation represents aerobic respiration. Glucose + oxygen -\u00bbcarbon dioxide + water+ energy<\/p>\nWhich of the following take place after we exercise?<\/h2>\n
\n(B) Our body needs to replace the energy used.
\n(C) Our body needs to get rid of excess carbon dioxide.
\n(D) All of these 53
\nAnswer:
\n(D) All of these 53<\/p>\n
\nOur body needs more energy when we do exercise. We get energy by the oxidation of food. Due to exercise the body is able to get rid of excess carbon dioxide.<\/p>\nWhich of these statements is correct about alveoli?<\/h2>\n
\n(B) They have a very thin wall.
\n(C) They are covered with blood capillaries.
\n(D) All of these
\nAnswer:
\n(D) All of these<\/p>\n
\nAlveoli have a large surface area with very thin walls which is richly supplied with blood vessels and are always moist.<\/p>\nAs air passes through the nasal cavity, it is<\/h2>\n
\n(B) Moistened by mucus
\n(C) Warmed to the body temperature
\n(D) Al of these
\nAnswer:
\n(D) Al of these<\/p>\n
\nBefore air is breathed into the lungs, it is filtered in the nostrils, moistened by mucus and gets warmer equal to the body temperature.<\/p>\nWhat prevents back flow of blood inside the heart during contraction?<\/h2>\n
\n(B) Thick muscular walls of ventricles
\n(C) Thin walls of atria
\n(D) Al of the above
\nAnswer:
\n(A) Valves in heart<\/p>\n
\nValves ensure that blood does not flow backwards when the atria or ventricles contract. Semilunar valves, the valves present between ventricles and their attached vessels, serve to prevent the backflow of blood to ventricles from their respective attached vessels. Likewise, atrioventricular (AV) valve between atrium and ventricle directs the flow of blood and prevents any backflow into atria.<\/p>\nSingle circulation, i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by<\/h2>\n
\n(B) Hippocampus, Exocoetus, Anabas
\n(C) Hyla, Ram, Draco
\n(D) Whale, Dolphin, Turtle
\nAnswer:
\n(B) Hippocampus, Exocoetus, Anabas<\/p>\n
\nHippocampus, Exocoetus, Ambas belong to class pisces. Fishes have two chambered heart and exhibit single circulation while three chambered heart of amphibians and reptiles and four chambered heart of birds and mammals exhibit double circulation.<\/p>\nThe blood leaving the tissues becomes richer in<\/h2>\n
\n(B) water
\n(C) haemoglobin
\n(D) oxygen 5
\nAnswer:
\n(A) carbon dioxide<\/p>\n
\nThe anterior vena cava collects deoxygenated blood from the head, chest, and arms and enters the right atrium while the inferior vena cava collects blood from the lower body regions. Both venae cavae pass the deoxygenated blood to the right atrium. Therefore, blood from tissues is rich in carbon dioxide.<\/p>\nThe xylem in plants are responsible for<\/h2>\n
\n(B) transport of food
\n(C) transport of amino acids
\n(D) transport of oxygen
\nAnswer:
\n(A) transport of water<\/p>\n
\nIn a plant, the xylem is responsible for transport of water.<\/p>\nWhich of the following statement(s) is (are) true about heart?<\/h2>\n
\n(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs.
\n(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts,
\n(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body<\/p>\n
\n(B) (ii)
\n(C) (ii) and (iv)
\n(D) (i) and (iii)
\nAnswer:
\n(C) (ii) and (iv)<\/p>\n
\nBlood from right atrium enters right ventricle and pulmonary arteries carry deoxygenated blood from right ventricle to lungs for oxygenation.<\/p>\nIn which of the following vertebrate group\/ groups, heart does not pump oxygenated blood to different parts of the body?<\/h2>\n
\n(B) Amphibians and reptiles
\n(C)Amphibians only
\n(D) Pisces only
\nAnswer:
\n(D) Pisces only<\/p>\n
\nIn fishes, heart sends the blood to gills from where blood is circulated to different orgAnswer:<\/p>\nChoose the correct statement that describes arteries.<\/h2>\n
\n(B) They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various organs of the body.
\n(C) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body.
\n(D) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.
\nAnswer:
\n(D) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.<\/p>\n
\nArteries are the valveless blood vessels which serve to transport the blood away from the heart to various body parts. The thick strong elastic walls of arteries withstand the high pressure of blood coming from heart.<\/p>\nWhich of these statements is correct about the function of blood?<\/h2>\n
\n(B) It regulates body temperature.
\n(C) It helps in transportation of waste products.
\n(D) All the above
\nAnswer:
\n(D) All the above<\/p>\n
\nBlood has many different functions, like transporting oxygen and nutrients to the lungs and tissues, regulating body temperature, forming blood clots to prevent excess blood loss, and carrying cells and antibodies that fight infection.<\/p>\nThe filtration units of kidneys are called<\/h2>\n
\n(B) urethra
\n(C) neurons
\n(D) nephrons
\nAnswer:
\n(D) nephrons<\/p>\n
\nNephrons are the structural and functional unit of kidney that serve in filtration, reabsorption and secretion. Ureters are small muscular tubes that extend from the kidney and carry urine into the urinary bladder. The urethra is a canal that carries urine from bladder and expels it out of body. Neurons are structural and functional unit of nervous system.<\/p>\nThe kidneys in human beings are a part of the sys-tem for<\/h2>\n
\n(B) respiration
\n(C) excretion
\n(D) transportation.
\nAnswer:
\n(C) excretion<\/p>\n
\nIn human beings, the kidneys are a part of the system for excretion.<\/p>\nMatch the words of Column (A) with that of Column (B)<\/h2>\n
\n\n
\n Column (A)<\/td>\n Column (B)<\/td>\n<\/tr>\n \n (A) Phloem<\/td>\n (i) Excretion<\/td>\n<\/tr>\n \n (B) Nephron<\/td>\n (ii) Translocation of food<\/td>\n<\/tr>\n \n (C) Veins<\/td>\n (iii) Clotting of blood<\/td>\n<\/tr>\n \n (D) Platelet<\/td>\n (iv) Deoxygenated blood<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n(B) A – (iii), B – (ii), C – (i), D – (iv)
\n(C) A – (iv), B – (iii), C – (ii), D – (i)
\n(D) A – (i), B – (iv), C – (iii), D – (iv)
\nAnswer:
\n(A) A – (ii), B – (i), C – (iv), D – (iii)
\nExplanation:
\nS. No. Column
\n(A) Column
\n(B) Explanation<\/p>\n\n\n
\n S. No<\/td>\n Column (A)<\/td>\n Column (B)<\/td>\n \u00a0Expianation<\/td>\n<\/tr>\n \n A<\/td>\n Phloem<\/td>\n (ii)<\/td>\n Phloem helps in translocation of food.<\/td>\n<\/tr>\n \n B<\/td>\n Nephron<\/td>\n (i)<\/td>\n Nephron helps in excretion.<\/td>\n<\/tr>\n \n C<\/td>\n Veins<\/td>\n (iv)<\/td>\n Veins carry deoxy-genated blood.<\/td>\n<\/tr>\n \n D<\/td>\n Platelets<\/td>\n (iii)<\/td>\n Platelets helps in clotting of blood.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Which of the following is the structural and functional unit of the excretory system?<\/h2>\n
\n(B) Nephron
\n(C) Alveolus
\n(D) Both (A) and (B)
\nAnswer:
\n(B) Nephron<\/p>\n
\nNephron is the structural and functional unit of excretory system.<\/p>\nChoose the correct path of urine in our body :<\/h2>\n
\n(B) kidney \u2192 urinary bladder \u2192 urethra \u2192 ureter
\n(C) kidney \u2192 ureters \u2014> urinary bladder \u2192urethra
\n(D) urinary bladder \u2192 kidney \u2192 ureter \u2192 urethra
\nAnswer:
\n(C) kidney \u2192 ureters \u2014> urinary bladder \u2192urethra<\/p>\n
\nKidneys are the paired organ where urine formation takes place. Small muscular tube, called as ureter, extend from kidneys and carry blood to urinary bladder. The urethra is a small tube that extends from the urinary bladder to an external opening.<\/p>\nWhich of the following substances are removed from blood in the kidneys?<\/h2>\n
\n(B) Urea
\n(C) Sodium
\n(D) Ammonia
\nAnswer:
\n(B) Urea<\/p>\n
\nUrea is removed by the blood in kidneys by filtration.<\/p>\nEach nephron has a cup shaped upper end called…………… . which contains a………. .<\/h2>\n
\n(B) Capillaries, Bowman’s capsule
\n(C) Ampulla, Glomerulus
\n(D) Bowman’s capsule, Glomerulus
\nAnswer:
\n(D) Bowman’s capsule, Glomerulus<\/p>\n
\nThe upper cup shaped end of a nephron is called Bowman’s capsule. It contains glomerulus which is a group of blood capillaries.<\/p>\nWhich of the following is used artificially to remove nitrogenous waste products from the blood?<\/h2>\n
\n(B) Transfusion
\n(C) Hemodialysis
\n(D) Angiogram
\nAnswer:
\n(C) Hemodialysis<\/p>\n
\nHemodialysis is used to remove nitrogenous waste products from the blood.<\/p>\n
\n(A) Both A and R are true and R is the correct explanation of A.
\n(B) Both A and R are true but R is NOT the correct explanation of A.
\n(C) A is true but R is false.
\n(D) A is false and R is true.<\/p>\nAssertion (A): HCl converts pepsinogen into active enzyme pepsin.
\nReason (R): Pepsin converts protein into proteoses and peptones.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nHCl creates an acidic medium, which facilitates activation of pepsinogen into pepsin. The active enzyme pepsin converts proteins into proteoses and peptones.<\/p>\nAssertion (A): Digestion breaks large complex molecules to simple smaller molecules which can be easily absorbed.
\nReason (R): Digestion is necessary for the absorption of all molecules.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nDigestion breaks large complex organic molecules to simple smaller ones which can be easily absorbed. However, certain molecules such as glucose, vitamin C etc, do not need any digestion before their absorption.<\/p>\nAssertion (A): Muscles of stomach wall possess thick layers of muscle fibers.
\nReason (R): These muscles help in mixing the food with the enzymes present in the alimentary canal.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nThe lining of alimentary canal has muscles that contract rhythmically in order to push the food forward. This is known as peristaltic movement.<\/p>\nAssertion (A): Lipases help in emulsification of fats.
\nReason (R): Lipases hydrolyses fats and oils.<\/h2>\n
\n(D) A is false and R is true.<\/p>\n
\nBile helps in emulsification of fats whereas lipases are the enzymes which hydrolyze fats and oils.<\/p>\nAssertion (A): Photosynthesis is an anabolic process.
\nReason (R): The process of photosynthesis occurs in chlorophyll.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nPhotosynthesis is an anabolic process as it takes C02 and H20 and then assembles them into glucose. The process of photosynthesis occurs in chloroplast.<\/p>\nAssertion (A): Energy is used during the process of respiration.
\nReason (R): Respiration stores energy in the form of ATP.<\/h2>\n
\n(D) A is false and R is true.<\/p>\n
\nRespiration involves the oxidation of glucose inside the mitochondria to produce energy, which is stored in the high energy bonds of ATP molecules as biologically useful energy.<\/p>\nAssertion (A): Humans are not truly aerobic.
\nReason (R): They produce lactic acid anaerobically.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nHumans are aerobically respiring animals, but sometimes anaerobic respiration takes place in certain tissues like skeletal muscles, which do not get immediately as much oxygen as it requires. Therefore, the muscles respire anaerobically and produce lactic acid from glucose.<\/p>\nAssertion (A): In humans, there is a complex respiratory system.
\nReason (R): Human skin is impermeable to gases.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nHumans need more oxygen to maintain their high metabolic rates. Thus, a complex respiratory system has evolved so as to meet this need.<\/p>\nAssertion (A): Alveoli contain an extensive network of blood vessels.
\nReason (R): Alveoli is the site where exchange of gases occurs.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nThe alveoli of lungs are richly supplied with blood and are the sites where exchange of gases (O2<\/sub> and CO2<\/sub>) occurs between blood and atmosphere.<\/p>\nAssertion (A): The muscular walls of ventricles are thicker than auricles.
\nReason (R): This helps in preventing the back flow of blood.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nSince ventricles have to pump blood into various organs, they have thicker muscular walls than atria do. Valves prevent back flow of blood.<\/p>\nAssertion (A): In human heart, there is no mixing of oxygenated and deoxygenated blood.
\nReason (R): Valves are present in the heart which allows the movement of blood in one direction only.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nThere is no mixing of oxygenated and deoxygenated blood due to presence of inter-auricular and inter – ventricular septum. On the other hand, valves are present in the heart which allows the movement of blood in one direction only.<\/p>\nAssertion (A): Valves are present in the arteries.
\nReason (R): Arteries carry oxygenated blood from heart to different body parts except pulmonary artery.<\/h2>\n
\n(D) A is false and R is true.<\/p>\n
\nValves are absent in arteries, I whereas it is present in veins, which prevent\u00a0 back flow of blood.<\/p>\nAssertion (A): Plants have low energy needs.
\nReason (R): Plant bodies have large proportion of dead cells.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nBecause plants have a large proportion of dead cells in many tissues. So, their energy needs are low and they can afford to have slow transport system.<\/p>\nAssertion (A): Human body produces highly toxic substances, which if not eliminated may cause the death.
\nReason (R): Excretory substance removes nitrog-enous waste from the body.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nThe biological process which involves the removal of harmful metabolic wastes from the body is called excretion. If these harmful wastes are not removed from the body, then it may cause the death of the organism.<\/p>\nAssertion (A): Excretory unit of kidneys are nephrons.
\nReason (R): It has no role in secretion of urine.<\/h2>\n
\n(C) A is true but R is false.<\/p>\n
\nNephrons are the basic filtration unit of kidneys. They carry out filtration, selective reabsorption and tubular secretion to from urine in kidneys, which is then passed out through the urethra, via the ureters and urinary bladder.<\/p>\nAssertion (A): Haemodialysis can save the life of patients with kidney failure.
\nReason (R): Waste products like urea can be removed from the blood by haemodialysis.<\/h2>\n
\n(A) Both A and R are true and R is the correct explanation of A.<\/p>\n
\nIn case of kidney failure, haemodialysis is the process of purifying blood (or removing waste products like urea) by an artificial kidney. This can save the life of the patient.<\/p>\nAssertion (A): In humans, major amount of water is absorbed by the tubular part of nephron.
\nReason (R): Absorption of water depends on the dissolved waste to be excreted from the body.<\/h2>\n
\n(B) Both A and R are true but R is NOT the correct explanation of A.<\/p>\n
\nMajor amount of water is selectively re-absorbed by the tubular part of nephron in humAnswer: It depends on the amount of excess water present in the body and dissolved waste to be excreted from the body.<\/p>\n
\nSanjana is suffering from a frequent stomach pain and vomiting. She went to the Doctor. The doctor asked her to go for an ultrasound. In the report, a stone was found in her gall bladder. Doctor asked her to remove the gall bladder by operation. But she was reluctant to go for the operation.<\/p>\nThe role played by gall bladder in human body is<\/h2>\n
\n(B) To secrete bile
\n(C) To emulsify fats
\n(D) To digest fats
\nAnswer:
\n(A) To store bile<\/p>\n
\nGall bladder stores bile.<\/p>\nRemoval of gall bladder<\/h2>\n
\n(B) Has no effect on the person’s health
\n(C) Effects the secretion of bile
\n(D) Effects the digestion of proteins
\nAnswer:
\n(B) Has no effect on the person’s health<\/p>\n
\nNo, the removal of gall bladder will not affect person’s health.<\/p>\nWhich of the following statement is correct about bile?<\/h2>\n
\n(B) It helps in digestion of carbohydrates
\n(C) It helps in absorption of digested food.
\n(D) It helps in egestion of undigested food.
\nAnswer:
\n(A) It helps in emulsification of fat.<\/p>\n
\nBile helps in emulsification of fat.<\/p>\nWhich part of alimentary canal receives bile from the liver?<\/h2>\n
\n(B) Small intestine
\n(C) Large intestine
\n(D) Oesophagus
\nAnswer:
\n(B) Small intestine<\/p>\n
\nBile is dark green or a yellowish brown fluid which is produced by the liver and comes to the small intestine through hepato-pancreatic duct.<\/p>\nWhat is the function of bile salt in the intestine?<\/h2>\n
\n(B) Emulsifier
\n(C) Co factor of cholesteryl esterase
\n(D) Inhibitor of lipid absorption
\nAnswer:
\n(B) Emulsifier<\/p>\n
\nBile contains bile salts that help in proper digestion of fats by breaking down large fat globules into smaller ones, so that enzyme can easily act on it and digest them. This process is known as emulsification of fats.<\/p>\n
\n<\/p>\nWhich of these correctly represent the labels B, C, D and E?<\/h2>\n
\n(B) B- Pancreas, C- Oesophagus, D- Liver, E- Stomach
\n(C) B- Stomach, C- Pancreas, D- Oesophagus, E- Liver
\n(D) B- Liver, C- Stomach, D- Pancreas, E- Oesophagus
\nAnswer:
\n(A) B- Oesophagus, C- Liver, D- Stomach, E- pancreas<\/p>\n
\nIn the given picture of human digestive system, B is Oesophagus, C is Liver,D is Stomach, and E is pancreas.<\/p>\nThe secretion that is released by label C is:<\/h2>\n
\n(B) Pepsin
\n(C) Saliva
\n(D) Gastric juice
\nAnswer:
\n(A) Bile<\/p>\n
\nLabel C represents liver. Liver secretes bile, which is stored in gall bladder.<\/p>\nName the digestive juice that lacks enzyme but helps in digestion.<\/h2>\n
\n(B) Pancreatic juice
\n(C) Ptyalin
\n(D) Pepsin
\nAnswer:
\n(A) Bile juice<\/p>\n
\nBile juice doesn’t contain any enzyme. It helps in digestion of fats.<\/p>\nThe digestion of food starts in<\/h2>\n
\n(B) D
\n(C) E
\n(D) F
\nAnswer:
\n(A) A<\/p>\n
\nLabel A represents mouth. The digestion of food starts in mouth.<\/p>\nIn case of diarrhoea, which major process does not takes place normally in region F?<\/h2>\n
\n(B) Absorption of water
\n(C) Secretion of hormones
\n(D) Removal of waste material
\nAnswer:
\n(B) Absorption of water<\/p>\n
\nAbsorption of water is not occurring normally in region F (Large I intestine).<\/p>\n
\nCO2<\/sub>+ H2<\/sub>OCO2<\/sub>+ C2<\/sub>H5<\/sub>OH +energy + energy
\n<\/p>\nIdentify X, Y and Z.<\/h2>\n
\n(B) X -Krebs’s cycle, Y-Aerobic, Z-Anaerobic
\n(C) X-Glycolysis, Y-Aerobic, Z-Anaerobic
\n(D) X-Glycolysis, Y-Aerobic, Z-Krebs’s cycle
\nAnswer:
\n(C) X-Glycolysis, Y-Aerobic, Z-Anaerobic<\/p>\n
\nThe label X represents the process of Glycolysis, Y – Aerobic respiration, and Z – Anaerobic respiration.<\/p>\nThe process X occurs in……….. and Y occurs in………. part of cell.<\/h2>\n
\n(B) Cytoplasm and mitochondria respectively
\n(C) Both takes place in cytoplasm
\n(D) Both takes place in mitochondria
\nAnswer:
\n(B) Cytoplasm and mitochondria respectively<\/p>\n
\nThe breakdown of glucose (a six- carbon molecule) into a three-carbon molecule called pyruvate takes place in the cytoplasm whereas the process of aerobic respiration takes place in mitochondria.<\/p>\nIn which of these organisms the process Z takes place?<\/h2>\n
\n(B) Humans
\n(C) Yeast
\n(D) Spirogyra
\nAnswer:
\n(C) Yeast<\/p>\n
\nThe Z (anaerobic respiration) takes place in yeast. Since the process takes place in the absence of air, it is called anaerobic respiration.<\/p>\nIn which part of human body do the process Z takes place?<\/h2>\n
\n(B) In kidneys
\n(C) In liver cells
\n(D) In leydig’s cell
\nAnswer:
\n(A) In muscle cells<\/p>\n
\nIn human body, Z (anaerobic\u00a0 respiration) takes place in muscle cells.<\/p>\nWhere does aerobic respiration occur in a cell ?<\/h2>\n
\n(B) Cytoplasm
\n(C) Nucleus
\n(D) Plastid
\nAnswer:
\n(A) Mitochondria<\/p>\n
\nAerobic respiration occurs in mitochondria. Since the process takes place in presence of air (oxygen), it is called aerobic respiration.<\/p>\n
\n<\/p>\nThe balloon like structures present in ‘S’ is:<\/h2>\n
\n(B) Alveoli
\n(C) Bronchi
\n(D) Bronchiole
\nAnswer:
\n(C) Bronchi<\/p>\n
\nThe balloon like structure are alveoli. Alveoli are air sacs at the end of bronchioles. They allow oxygen and carbon dioxide to move between the lungs and the blood-stream.<\/p>\nWhich of these organ is surrounded by cartilaginous rings?<\/h2>\n
\n(B) Q
\n(C) R
\n(D) S
\nAnswer:
\n(C) R<\/p>\n
\nR (Trachea) is supported by rings I of cartilage.<\/p>\nWhich of these statements is incorrect regarding human lungs?<\/h2>\n
\n(B) It is located on the two sides of heart.
\n(C) The membrane that encloses lungs is pleural membrane.
\n(D) The alveolar epithelium of lungs is non-ciliated epithelium.
\nAnswer:
\n(A)It is the secondary organ for respiration.<\/p>\n
\nLungs are the primary breathing organ. It is the main respiratory surface available for the exchange of gases (O2<\/sub> CO2<\/sub>).<\/p>\nTrachea is divided into two smaller tubes called………… .<\/h2>\n
\n(B) Bronchioles
\n(C) Larynx
\n(D) Alveoli
\nAnswer:
\n(A) Bronchi<\/p>\n
\nPharynx splits into trachea and oesophagus. It connects the larynx to the bronchi of the lungs. It provides air flow to and from the lungs for respiration.<\/p>\nWhich of these is the function of balloon like structure present in lungs?<\/h2>\n
\n(B) Absorption of nutrients
\n(C) Transport of food
\n(D) Removal of waste materials
\nAnswer:
\n(A) Exchange of gases<\/p>\n
\nThe balloon like structure called alveoli allow oxygen and carbon dioxide to move between the lungs and the blood-stream.<\/p>\nIdentify the part\u00a0 in excretion.<\/h2>\n
\n(B) Ureter
\n(C) Urethra
\n(D) Nephron
\nAnswer:
\n(B) Ureter<\/p>\n
\nPart is ureter. It transports urine from kidney to urinary bladder.<\/p>\nWhich of these is the structural and functional unit of part 2?<\/h2>\n
\n(B) Nephron
\n(C) Neuron
\n(D) None of these
\nAnswer:
\n(B) Nephron<\/p>\n
\nNephrons are the structural and functional filtration unit of kidney that serve in filtration, reabsorption and secretion.<\/p>\nHow can we purify the blood by artificial methods?<\/h2>\n
\n(B) Dialysis
\n(C) Reabsorption
\n(D) All of these
\nAnswer:
\n(B) Dialysis<\/p>\n
\nUrea is the main waste present in the urine.<\/p>\nThe main waste present in the urine is:<\/h2>\n
\n(B) Urea
\n(C) Blood
\n(D) Protein
\nAnswer:
\n(B) Urea<\/p>\n
\nDialysis is a procedure to remove waste products and excess fluid from the blood when the kidneys stop working properly. It often involves diverting blood to a machine to be cleaned.<\/p>\nChoose the correct path of urine in our body:<\/h2>\n
\n(B) kidney \u2192 urinary bladder \u2192 urethra \u2192 ureter
\n(C) kidney \u2192 ureters \u2192 urinary bladder \u2192 urethra
\n(D) urinary bladder \u2192 kidney \u2192 ureter \u2192 urethra
\nAnswer:
\n(C) kidney \u2192 ureters \u2192 urinary bladder \u2192 urethra<\/p>\n
\nKidneys are the paired organs where urine formation takes place. Small muscular tube, called as ureter, extend from kidneys and carries urine to urinary bladder. The urethra is a small tube that extends from the urinary bladder to an external opening.<\/p>\nWhich of these correctly represents the label A, B, C and D in the above passage?<\/h2>\n
\n(B) A- Right ventricle, B- Left atrium, C- Left Ventricle, D- Right atrium
\n(C) A- Right atrium, B- Right ventricle, C- Left atrium, D- Left ventricle
\n(D) A- Left ventricle, B- Right atrium, C- Right ventricle, D- Left atrium
\nAnswer:
\n(A) A- Left atrium, B- Left Ventricle, C- Right atrium, D- Right ventricle<\/p>\n
\nA is Left atrium, B is Left Ventricle, C is Right atrium, and D is Right ventricle.<\/p>\nWhich chambers of human heart contain oxygenated blood?<\/h2>\n
\n(B) A and C
\n(C) C and B
\n(D) C and D
\nAnswer:
\n(A) A and B<\/p>\n
\nA (Left atrium) and B (Left ventricle) contain oxygenated blood from lungs.<\/p>\nWhat is the correct route of blood in a human?<\/h2>\n
\n(B) A \u2192 B \u2192 D \u2192 C \u2192 Lungs
\n(C) C \u2192 D \u2192 B\u2192 A \u2192 Lungs
\n(D) C \u2192 D \u2192 Lung \u2192 A \u2192 B
\nAnswer:
\n(D) C \u2192 D \u2192 Lung \u2192 A \u2192 B<\/p>\n
\nThe correct route of blood in a human is : C (Right atrium)\u2192 D (Right ventricle) \u2192Lungs \u2192 A (Left atrium) \u2192 B (Left ventricle.<\/p>\nWhat prevents backflow of blood inside the heart during contraction?<\/h2>\n
\n(B) Thick muscular walls of ventricles
\n(C) Thin walls of atria
\n(D) All of the above
\nAnswer:
\n(A) Valves in heart<\/p>\n
\nValves prevent the back flow of blood inside the heart during contraction of heart chambers (atria or ventricles).<\/p>\nAssertion (A): Human heart does not allow mixing of oxygen rich blood with carbon dioxide rich blood.
\nReason (R): Human heart has different chambers.<\/h2>\n
\n(B) Both A and R are true but R is not the correct explanation of the assertion.
\n(C) A is true but R is false.
\n(D) A is false but R is true.
\nAnswer:
\n(C) A is true but R is false.<\/p>\n
\nHuman heart is four chambered. It is composed of four chambers : right atrium, right ventricle, left ventricle and left atrium. The chambers are separated by a muscular wall that prevents the mixing of the blood rich in oxygen with the blood rich in carbon dioxide.<\/p>\n
\nSome experiments were carried out using Croton sp. plants to understand the process of photosynthesis. It was observed that the leaves of the plant exposed to light for longer duration accumulated more starch. However, due to presence of pre-formed starch in the leaves, it was difficult to find the net productivity on a fixed exposure to light source. Therefore, it was necessary to obtain starch free leaves in the plant before starting the experiment.<\/p>\nWhich of the following would help obtain starch free leaves in the plant?<\/h2>\n
\n(B) Keep the plant in dark for about 48 hours before starting the experiment.
\n(C) Remove starch from the leaves by exosmosis, 48 hours before starting the experiment.
\n(D) Keep the leaves to red light for 48 hours before starting the experiment.
\nAnswer:
\n(B) Keep the plant in dark for about 48 hours before starting the experiment.<\/p>\n
\nThe starch free leaves can be j obtained by keeping the plant in dark, so that 1 already present starch is utilized in 48 hrs.<\/p>\nAfter a period of illumination, the leaves were boiled in alcohol to make them colourless. Which of the following could be used to test the end product stored in the leaves?<\/h2>\n
\n(B) Litmus paper
\n(C) Iodine solution
\n(D) Copper sulphate solution
\nAnswer:
\n(C) Iodine solution<\/p>\n
\nStarch presence can be tested by adding iodine solution which gives bluish black colour of starch iodine mixture.<\/p>\nSome of the starch free leaves were coated with wax on both the surfaces. The plant was maintained under normal environmental conditions. At the end of the experiment, the wax coated leaves are likely to show .<\/h2>\n
\n(B) Wilting of the wax coated leaves.
\n(C) Increase in sucrose accumulation.
\n(D) Decrease in number of chloroplasts
\nAnswer:
\n(B) Wilting of the wax coated leaves.<\/p>\n
\nWilting occurs due to wax blocks the transpiration so water transportation inhibits.<\/p>\nDuring the morning hours, using a fine blade, an incision was made to the leaves such that the phloem tissue was cut open. Analysis of the liquid oozing out was found to contain high amount of:<\/h2>\n
\n(B) Ribose
\n(C) Sucrose
\n(D) Galactose
\nAnswer:
\n(C) Sucrose<\/p>\n
\nThe transport of glucose, occurs in the form of sucrose, in phloem therefore, when cell sap oozes out, liquid contains sucrose.<\/p>\nThe equation given below represents photosynthesis. Identify P and Question
\n<\/h2>\n
\n(B) P – Oxygen, Q – Oxygen
\n(C) P – Carbon dioxide, Q – Carbon dioxide
\n(D) P – Oxygen, Q – Carbon dioxide
\nAnswer:
\n(A) P – Carbon dioxide, Q – Oxygen<\/p>\n
\nThe process by which autotrophs take in CO2 <\/sub>and H2 <\/sub>O and convert these into carbohydrates in the presence of chlorophyll, and sunlight is called photosynthesis.
\nEquation for photosynthesis is :
\n<\/p>\nMCQ Questions for Class 10 Science with Answers<\/a><\/h4>\n","protected":false},"excerpt":{"rendered":"