\n2. For eg. all green plant are autotrophs.<\/td>\n | 2. For eg. all animals, human beings and non-green plants like bacteria and fungi.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 2. \nWhere do plant get each of the raw materials required for photosynthesis ? \nAnswer: \nBreak-down of pryuvate using (CO2<\/sub>) takes place in the mitochondria. Exchange of gases takes place through stomata and water from soil through root hairs and light\/temperature from the sun and green colour from chlorophyll and the photosynthesis occurs in the grana of chloroplast and respiration in the stroma of chloroplast. So the required raw material for photosynthesis are : \n(i) Sunlight, (ii) CO2<\/sub>, (iii) H2<\/sub>O (iv) Chlorophyll<\/p>\n<\/p>\n Question 3. \nWhat is the role of the acid in our stomach ? \nAnswer: \nHCL \n(a) It makes the medium acidic. \n(b) Softens the food. \n(c) Kill germs i.e., bacteria\/any foreign organism.<\/p>\n Question 4. \nWhat is the function of digestion enzymes ? \nAnswer: \nIn Mouth (i) Salivary Amylase: Starch (complex sugars) \u2192 Maltose \nIn stomach (ii) (a) Pepsin \u2013 Proteins \u2192 peptones and proteoses \n(b) Renin \u2013 Curdles milk (-nt in adults) \n<\/p>\n In Duodenum: 1. Bile juice \u2013 Alkaline \u2013 Emulsifies fat. \n2. Pancreatic juice \u2013 do \u2013 \n(a) Trypsin : Proteins\u2192 Peptones \nProteoses \u2192 Amino Acid and Peptides \n(b) Amylosin : Complex sugars \u2192 monosaccharides \n(c) Lipase : Fats \u2192 Fatty acids and glycerol<\/p>\n In Small Intestine \u2013 Intestinal juice \u2013 Alkaline \u2013 \n(i) Erepsin : Peptides \u2192 Amino Acids \n(ii) Invertase : Cane sugar \u2192 Glucose + Fructose \n(iii) Lactase : Lactose \u2192 glucose + galactose<\/p>\n Question 5. \nHow is the small intestine designed to absorb digested food ? \nAnswer: \nSmall Intestine: Small intestine is about 6 metres in length and 2.5 cm in diameter. It remains coiled in the abdominal cavity. The small intestine consists of three parts.<\/p>\n \n- Duodenum : It is U shaped in appearance. The openings of common bile duct and pancreatic duct opens in it.<\/li>\n
- Jejunum : It is about 2.5 metres long.<\/li>\n
- Ileum : It is about 3.5 metres long. It is distal in position.<\/li>\n<\/ul>\n
In-text Questions (Page 105)<\/span><\/p>\nQuestion 1. \nWhat advantage over an aquatic organism does a terrestrial organism have with regards to obtaining oxygen for respiration ? \nAnswer: \nThe organisms that live in water use the oxygen fairly low compared to the amount of oxygen in the air. So the rate of breathing is aquatic organisms is much faster than that seen in terrestrial organisms<\/p>\n <\/p>\n Question 2. \nWhat are the different ways in which glucose is oxidised to provide energy in various organisms ? \nAnswer: \nA biochemical process of stepwise oxidation or breaking down of organic compounds (simple carbohydrate like glucose) to release energy inside the hying cell at body temperature. The energy released in respiration sets stored in Adenosine Triphosphate [ATP] molecules. \n<\/p>\n Question 3. \nHow is oxygen and carbon dioxide transported in human beings? \nAnswer: \nWhen haemoglobin combines with oxygen it forms oxyhaemoglobin.<\/p>\n |