CBSE Class 7

Physical and Chemical Changes Class 7 Extra Questions and Answers Science Chapter 6 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 6 Extra Questions and Answers Physical and Chemical Changes

Extra Questions for Class 7 Science Chapter 6 Physical and Chemical Changes with Answers

Physical and Chemical Changes Class 7 Extra Questions Very Short Answer Type

Question 1.
Why is cutting of paper a physical change?
Answer:
Because properties of paper do not change on cutting.

Question 2.
A piece of chalk becomes powdery on pressing. Which type of change is it?
Answer:
Physical.

Question 3.
What is freezing mixture?
Answer:
A mixture of ice and common salt.

Question 4.
What happens when water is heated?
Answer:
It gets converted into vapours.

Question 5.
What are physical properties?
Answer:
Properties such as shape, size, colour and state of a substance are called its physical properties.

Question 6.
In which type of change, no new substance is formed?
Answer:
Physical change.

Question 7.
Write equation for burning of magnesium ribbon.
Answer:
Magnesium (Mg) + Oxygen (O₂) → Magnesium Oxide (MgO)

Question 8.
Which type of change is explosion of a firework?
Answer:
Chemical change.

Question 9.
What happens if a cut apple is kept open for a while?
Answer:
The open surface acquires a brown colour.

Question 10.
Write the necessary conditions for rusting.
Answer:
Presence of water vapour and air.

Physical and Chemical Changes Class 7 Extra Questions Short Answer Type 1

Question 1.
Is melting of ice a chemical change? Give reason.
Answer:
No. When ice melts into water, no new substance is formed. Only the physical form of ice is changed. So, it is not a chemical change.

Question 2.
What happens when a hack-saw blade is heated?
Answer:
When a hack-saw blade is heated, it becomes red in colour. It starts emitting light.

Question 3.
What happens when magnesium oxide is dissolved in water? Write the chemical equation for the reaction.
Answer:
On dissolving magnesium oxide in water, magnesium hydroxide is produced. This chemical change can be written in the form of the following equation:

Magnesium oxide (MgO) + Water (H₂) → Magnesium hydroxide [Mg(OH)₂]

Question 4.
Write two importances of chemical changes.
Answer:

1. Extraction of all metals requires chemical changes.
2. Useful new materials, such as plastics and detergents, are produced by chemical reactions.

Question 5.
Why is it advised not to play with fireworks?
Answer:
Explosion of a firework is a chemical change. Such an explosion produces heat, light, sound and harmful gases that pollute the atmosphere. That is why, it is advised not to play with fireworks.

Question 6.
What is stainless steel?
Answer:
Stainless steel is an alloy of iron which does not rust, hence the name stainless steel. It is made by mixing iron with carbon and metals like chromium, nickel and manganese.

Physical and Chemical Changes Class 7 Extra Questions Short Answer Type 2

Question 1.
What happens when iron nail is dipped into copper sulphate solution?
Answer:
The blue colour solution of copper sulphate changes into a green coloured solution.

The change of colour of the solution front blue to green is due to the formation of iron sulphate, a new substance. The brown substance deposit on the iron nail is copper, another new substance. We can write the reaction as:

Copper Sulphate solution (blue) + Iron → Iron Sulphate solution (green) + Copper (brown deposit).

Question 2.
What happens when carbon dioxide is passed through lime water? Give chemical equation.
Answer:
When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes lime water milky. The turning of lime water milky is a standard test of presence of carbon dioxide.

Carbon dioxide (CO₂) + Lime water[Ca(OH)₂] → Calcium Carbonate(CaCo₃) + Water(H₂O)

Question 3.
What does ozone do for us?
Answer:
It protects us from the harmful ultraviolet radiations which come from the sun. Ozone absorbs this radiation and breaks down to oxygen.

If ultraviolet radiations were not absorbed by ozone, they would reach the earth’s surface and cause harm to us and other life forms. Ozone acts as a natural shield against these radiations.

Question 4.
Why has a fraction of ships iron to be replaced every year?
Answer:
Ships are made of iron and a part of them remains underwater. On the part above water also, water drops keep clinging to the ship’s outer surface. Moreover, the water of the sea contains many salts. The saltwater makes the process of rust formation faster. Therefore, ships suffer a lot of damage from rusting in spite of being painted. So much so, that a fraction of ship’s iron has to be replaced every year.

Physical and Chemical Changes Class 7 Extra Questions Long Answer Type

Question 1.
What happens when baking soda is added to vinegar and the resulting gas is passed through lime water?
Answer:
On adding baking soda to vinegar, a hissing sound is heard and bubbles are seen coming out. When this gas is passed through lime water, it turns milky.

The change in the test tube is as follows:
Vinegar (Acetic acid) + Baking soda (Sodium hydrogen carbonate) → Carbon dioxide + other substances

The reaction between carbon dioxide and lime water is as follows:
Carbon dioxide (CO₂) + Lime water [Ca(OH)₂] → Calcium Carbonate (CaC0₃) + Water (H₂0)

When carbon dioxide is passed through lime water, calcium carbonate is formed, which makes lime water milky. The turning of lime water milky is a standard test of carbon dioxide.

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Acids, Bases and Salts Class 7 Extra Questions and Answers Science Chapter 5 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 5 Extra Questions and Answers Acids, Bases and Salts

Extra Questions for Class 7 Science Chapter 5 Acids, Bases and Salts with Answers

Acids, Bases and Salts Class 7 Extra Questions Very Short Answer Type

Question 1.
What is common in the sour-tasting substances?
Answer:
They contain acids.

Question 2.
Name two naturally occurring indicators.
Answer:
Turmeric, litmus.

Question 3.
Name some common acids and bases and their sources.
Answer:

Question 4.
What are the various colours of litmus paper?
Answer:
Red and blue.

Question 5.
What is the colour of litmus in distilled water?
Answer:
Mauve (purple).

Question 6.
Why acids and bases should be handled with care?
Answer:
Great care should be taken while handling laboratory acids and bases because these are corrosive in nature, irritating and harmful to skin.

Question 7.
How is the soil treated when it becomes too acidic?
Answer:
When the soil becomes too acidic, it is treated with bases like quick lime (calcium oxide) or slaked lime (calcium hydroxide).

Question 8.
What is done if soil becomes too basic?
Answer:
If the soil becomes too basic, organic matter is added to it. Organic matter releases acids which neutralises the basic nature of the soil.

Question 9.
Name one antacid.
Answer:
Milk of magnesia, which contains magnesium hydroxide.

Question 10.
What does calamine solution contain?
Answer:
Zinc Carbonate.

Acids, Bases and Salts Class 7 Extra Questions Short Answer Type 1

Question 1.
How is lime water prepared?
Answer:
To prepare limewater, some lime (chuna) is dissolved in water. The solution is stirred and is left for some time. Later a little clear solution from the top is decanted. This is lime water.

Question 2.
How does rain become acidic?
Answer:
The rain becomes acidic because carbon dioxide, sulphur dioxide and nitrogen dioxide (which are released into the air as pollutants) dissolve in raindrops to form carbonic acid, sulphuric acid and nitric acid respectively, making rainwater acidic.

Question 3.
How is an ant’s sting relieved?
Answer:
When an ant bites, it injects an acidic liquid into the skin. The effect of the sting can be neutralised by rubbing moist baking soda (sodium hydrogen carbonate) or calamine solution which contain zinc carbonate as both of these are bases.

Acids, Bases and Salts Class 7 Extra Questions Short Answer Type 2

Question 1.
What should be done to neutralise acidic factory wastes and why?
Answer:
The wastes of many factories contain acids. If they are allowed to flow into the water bodies, the acids will kill fish and other organisms. The factory wastes are, therefore, neutralised by adding basic substances.

Acids, Bases and Salts Class 7 Extra Questions Long Answer Type

Question 1.
Write a brief note on litmus?
Answer:
The most commonly used natural indicator is litmus. It is extracted from lichens. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns blue. It is available in the form of a solution, or in the form of strips of paper, known as litmus paper. Generally, it is available as red and blue litmus paper.

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Heat Class 7 Extra Questions and Answers Science Chapter 4 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 4 Extra Questions and Answers Heat

Extra Questions for Class 7 Science Chapter 4 Heat with Answers

Heat Class 7 Extra Questions Very Short Answer Type

Question 1.
What is a clinical thermometer?
Answer:
The thermometer that is used to measure human body temperature is called a clinical thermometer.

Question 2.
How is degree Celsius denoted?
Answer:
°C.

Question 3.
What is the range of a clinical thermometer?
Answer:
35°C to 42°C.

Question 4.
What is the normal temperature of human body?
Answer:
The normal temperature of human body is 37°C.

Question 5.
Which gets hotter soon, land or water?
Answer:
Land.

Heat Class 7 Extra Questions Short Answer Type 1

Question 1.
Why is range of a clinical thermo¬meter is chosen to be 35°C to 42°C?
Answer:
The clinical thermometer is designed to measure the temperature of human body only. The temperature of human body normally does not go below 35°C or above 42 GC. That is why, the clinical thermometer has the range 35°C to 42°C.

Question 2.
What caution do you suggest regarding a clinical thermometer?
Answer:
A clinical thermometer should not be be used for measuring the temperature of any object other than the human body. Also avoid keeping the thermometer in the sun or near a flame. It may break.

Question 3.
Why should you wear white clothes in summer and black clothes in winter?
Answer:
Dark surfaces absorb more heat and, therefore, w’e feel comfortable with dark -coloured clothes in the winter. Light coloured clothes reflect most of the heat that falls on them and, therefore, we feel more comfortable wearing them in the summer.

Heat Class 7 Extra Questions Short Answer Type 2

Question 1.
Describe the construction of a clinical thermometer.
Answer:
A clinical thermometer consists of a long, narrow, uniform glass tube. It has a bulb at one end. This bulb contains mercury. Outside the bulb, a small shining thread of mercury can be seen. There is also a Celsius scale on the thermometer.

Heat Class 7 Extra Questions Long Answer Type

Question 1.
How do land and sea breezes blow?
Answer:
During the day, the land gets heated faster than the water. The air over the land becomes hotter and rises up. The cooler air from the sea rushes in towards the land to take its place. The air forms the sea breeze. The warm air from the land moves towards the sea to complete the cycle.

At nigh it is exactly the reverse. The water cools down more slowly than the land. So, the cool air from the land moves towards the sea. This forms the land breeze.

Question 2.
Show the formation of land and sea breezes with the help of diagrams.
Answer:

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Fibre to Fabric Class 7 Extra Questions and Answers Science Chapter 3 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 3 Extra Questions and Answers Fibre to Fabric

Extra Questions for Class 7 Science Chapter 3 Fibre to Fabric with Answers

Fibre to Fabric Class 7 Extra Questions Very Short Answer Type

Question 1.
Name three animals that yield wool.
Answer:
Sheep, goat, yak.

Question 2.
In which areas are yaks found in plenty?
Answer:
Tibet and Ladakh.

Question 3.
Which animal provides Pashmina shawls?
Answer:
Kashmiri goat.

Question 4.
What is the diet of sheep?
Answer:
Grass, leaves, mixture of pulses, corn, jowar, oil cakes and minerals.

Question 5.
In which season sheep are sheared?
Answer:
Summer.

Question 6.
What are burrs?
Answer:
Small fluffy fibres found in hair of sheep are called burrs.

Question 7.
What are silkworms?
Answer:
Larvae of silk moth are called silkworms.

Question 8.
Name one disease that occurs in sheep.
Answer:
Anthrax. It is a fatal blood disease.

Question 9.
What is cocoon?
Answer:
For pupa stage, the caterpillar completely covers itself by silk fibres. This covering is known as cocoon.

Question 10.
What is the most common silk moth?
Answer:
Mulberry silk moth.

Fibre to Fabric Class 7 Extra Questions Short Answer Type 1

Question 1.
What is selective breeding?
Answer:
The process of selecting parents for obtaining special characters in their offspring, is termed ‘selective breeding’.

Question 2.
Write about the food of sheep.
Answer:
Apart from grazing sheep, rearers also feed them on a mixture of pulses, corn, jowar, oil cakes (material left after taking out oil from seeds) and minerals. In winter, sheep are kept indoors and fed on leaves, grain and dry fodder.

Question 3.
How is reeling of silk done?
Answer:
Reeling is done with special machines, which unwind the threads or fibres of silk from the cocoon. Silk fibres are then spun into silk threads.

Fibre to Fabric Class 7 Extra Questions Short Answer Type 2

Question 1.
How is shearing of wool done?
Answer:
Machines similar to those used by barbers are used to shave off hair. Usually, hair are removed during the hot weather. This enables sheep to survive without their protective coat of hair. The hair provide woollen fibres. Woollen fibres are then processed to obtain woollen yarn. Shearing does not hurt the sheep because uppermost layers of skin is dead.

Question 2.
How is silk processed?
Answer:
A pile of cocoons is used for obtaining silk fibres. The cocoons are kept under the sun or boiled or exposed to steam. The silk fibres are separate out. The process of taking out threads from the cocoon for use as silk is called reeling the silk. Reeling is done in special machines, which unwind the threads or fibres of silk from the cocoon. Silk fibres are then spun into silk threads, which are woven into silk cloth by weavers.

Fibre to Fabric Class 7 Extra Questions Long Answer Type

Question 1.
How is woollen cloth made after scouring hair of sheep?
Answer:

1. After scouring, sorting is done. The hairy skin is sent to a factory where hair of different textures are separated or sorted.
2. The small fluffy fibres, called burrs, are picked out from the hair. The fibres are scoured again and dried. This is the wool ready to be drawn into fibres.
3. The fibres can be dyed in various colours, as the natural fleece of sheep and goats is black, brown or white. The fibres are straightened, combed and rolled into yarn.
4. The longer fibres are made into wool for sweaters and the shorter fibres are spun and woven into woollen cloth.

Question 2.
Describe the life history of silk moth.
Answer:
The female silk moth lays eggs, from which hatch larvae which are called caterpillars or silkworms.

1. They grow in size and when the caterpillar is ready to enter the next stage of its life history called pupa, it first weaves a net to hold itself.
2. Then it swings its head from side to side in the form of the figure of eight (8).
3. During these movements of the head, the caterpillar secretes fibre made of a protein which hardens on exposure to air and becomes silk fibre.
4. Soon the caterpillar completely covers itself by silk fibres. This covering is known as cocoon.
5. The further development of the moth continues inside the cocoon.
6. Finally, it comes out of the cocoon as silk- moth.

Question 3.
Draw figures to describe life history of silk moth.
Answer:

Question 4.
How is rearing of silkworm done?
Answer:

1. A female silk moth lays hundreds of eggs at a time. The eggs are stored carefully on strips of cloth or paper and sold to silkworm farmers.
2. The farmers keep eggs under hygienic conditions and under suitable conditions of temperature and humidity.
3. The eggs are warmed to a suitable temperature for the larvae to hatch from eggs.
4. This is done when mulberry trees bear a fresh crop of leaves. The larvae, called caterpillars or silkworms, eat day and night and increase enormously in size.
5. The worms are then kept in clean bamboo trays along with freshly chopped mulberry leaves.
6. After 25 to 30 days, the caterpillars stop eating and move to a tiny chamber of bamboo in the tray to spin cocoons.
7. Small racks or twigs may be provided in the trays to which cocoons get attached. The caterpillar or silkworm spins the cocoon inside which develops the silk moth.

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Nutrition in Animals Class 7 Extra Questions and Answers Science Chapter 2 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 2 Extra Questions and Answers Nutrition in Animals

Extra Questions for Class 7 Science Chapter 2 Nutrition in Animals with Answers

Nutrition in Animals Class 7 Extra Questions Very Short Answer Type

Question 1.
What does animal nutrition include?
Answer:
Animal nutrition includes nutrient requirement, mode of intake of food and its utilisation in the body.

Question 2.
Name the largest gland of the human body.
Answer:
Liver.

Question 3.
What is digestive system?
Answer:
The digestive tract and the associated glands together constitute the digestive system.

Question 4.
Name the four types of teeth.
Answer:
Incisor, canine, premolar and molar.

Question 5.
What is the function of saliva?
Answer:
It breaks down starch into simple sugar.

Question 6.
What is cud?
Answer:
The partially digested food stored in rumen is called cud.

Nutrition in Animals Class 7 Extra Questions Short Answer Type 1

Question 1.
Write the arrangement of teeth in mouth.
Answer:
The arrangement of teeth from left to right is as follows:
3 molars + 2 premolars + 1 canine + 4 incisors + 1 canines + 2 premolars + 3 molars.

Question 2.
What should one do to keep teeth healthy?
Answer:

1. One should clean the teeth with a brush or dantun.
2. One should use dental floss (a special strong thread which is moved between two teeth to take out trapped food particles) at least twice a day.
3. One should rinse the mouth properly after every maeal.
4. Also, one should not put dirty fingers or any unwashed object into the mouth.

Question 3.
Draw a diagram to show movement of food in the oesophagus of alimentary canal.
Answer:

Question 4.
What is stomach?
Answer:
The stomach is a thick-walled bag. Its shape is like a flattened U and it is the widest part of the alimentary canal.

Question 5.
What is amoeba?
Answer:
Amoeba is a microscopic single-celled organism usually found in pond water. Amoeba has a cell membrane, a rounded, dense nucleus and many small bubble-like vacuoles in its cytoplasm.

Question 6.
What is alimentary canal?
Answer:
The complete track from mouth to anus through which food is taken, digested, absorbed and undigested food or waste passes out is called alimentary canal.

Nutrition in Animals Class 7 Extra Questions Short Answer Type 2

Question 1.
Name all the parts of alimentary canal.
Answer:

1. The buccal cavity
2. oesophagus
3. stomach
4. small intestine
5. large intestine and
6. the anus.

Question 2.
Draw a diagram of arrangement of teeth in mouth.
Answer:

Question 3.
What is tooth decay?
Answer:
If we do not clean our teeth and mouth after eating, many harmful bacteria also begin to live and grow in it. These bacteria break down the sugars present in the leftover food and release acids. The acids gradually damage the teeth. This is called tooth decay.

Question 4.
Draw a figure of amoeba and show its various parts.
Answer:

Nutrition in Animals Class 7 Extra Questions Long Answer Type

Question 1.
Write the functions of stomach.
Answer:
It receives food from the food pipe or oesophagus at one end and opens into the small intestine at the other.

The inner lining of the stomach secretes mucous, hydrochloric acid and digestive juices. The mucous protects the lining of the stomach. The acid kills many bacteria that enter along with the food and makes the medium in the stomach acidic. The digestive juices break down the proteins into simpler substances called amino acids.

Question 2.
Write briefly about the large intestine.
Answer:
The large intestine is wider and shorter than small intestine. It is about 1.5 metre in length. Its function is to absorb water and some salts fro‘m the undigested food material. The remaining waste passes into the rectum and remains there as semi-solid faeces. The faecal matter is removed through the anus from time- to-time. This is called egestion.

Question 3.
How does nutrition occurs in amoeba?
Answer:
Amoeba feeds on some microscopic organisms. When it senses food, it pushes out pseudopodia around the food particle and engulfs it. The food becomes trapped in a food vacuole.

Digestive juices are secreted into the food vacuole. They act on the food and break it down into simpler substances. Gradually the digested food is absorbed. The absorbed substances are used for growth, maintenance and multiplication. The undigested residue of the food is expelled outside by the vacuole.

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Nutrition in Plants Class 7 Extra Questions and Answers Science Chapter 1 PDF are solved by experts and will guide students in the right direction. Students can get how to tackle different questions easily by solving the Extra Questions for Class 7 Science Question bank on a regular basis.

Class 7 Science Chapter 1 Extra Questions and Answers Nutrition in Plants

Extra Questions for Class 7 Science Chapter 1 Nutrition in Plants with Answers

Nutrition in Plants Class 7 Extra Questions Very Short Answer Type

Question 1.
Name the things necessary for photosynthesis.
Answer:
Carbon dibxide, water, chlorophyll, sunlight.

Question 2.
Which is the ultimate source of energy?
Answer:
The sun.

Question 3.
What is the function of chlorophyll?
Answer:
It helps leaves to capture the energy of the sunlight.

Question 4.
Is there any organ other than leaves where photosynthesis takes place?
Answer:
Yes. Photosynthesis takes place in all green parts of the plant be it stem or branches, e.g., cactus.

Question 5.
What are algae?
Answer:
Algae are microorganisms. They are found as slimy, green patches in ponds or in other stagnant water bodies.

Question 6.
Which bacteria can convert nitrogen into soluble form?
Answer:
Rhizobium.

Question 7.
Name two leguminous plants.
Answer:
Pea, gram.

Nutrition in Plants Class 7 Extra Questions Short Answer Type 1

Question 1.
Why are plants called autotrophs?
Answer:
Auto means self and trophos means nourishment. So, autotrophs means organisms that can make nutrients for themselves. Plants are such organism so, they are called autotrophs.

Question 2.
What do you mean by heterotrophs?
Answer:
Heteros means other; trophos mean nourishment. So, heterotrophs mepns organisms that depend on others for their nutrition. Animals including man are such organisms.

Question 3.
How is Sun the ultimate source of energy for all the living beings?
Answer:
Green plants prepare food utilising sunlight. All other organisms depend on green plants directly or indirectly for their nutrition. So, Sun is the ultimate source of energy.

Question 4.
How do fungi derive nutrition?
Answer:
Fungi secrete digestive juices on the dead and decaying matter and convert it into a solution. Then they absorb the nutrients from it.

Nutrition in Plants Class 7 Extra Questions Short Answer Type 2

Question 1.
What are stomata? Draw diagram.
Answer:
The small pores present on the surface of the leaves are called stomata. They are surrounded by ‘guard cells’. They help in taking carbon dioxide and releasing during photosynthesis.

Question 2.
What do you mean by symbiotic relationship?
Answer:
Some organisms live together and share shelter and nutrients. This is called symbiotic relationship. For example, certain fungi live in the roots of trees. The tree provides nutrients to the fungus and, in return, receives help from it to take up water and nutrients from the soil.

Question 3.
What are saprotrophs?
Answer:
The mode of nutrition in which organisms take in nutrients in solution form from dead and decaying matter is called saprotrophic nutrition. Plants which use saprotrophic mode of nutrition are called saprotrophs.

Nutrition in Plants Class 7 Extra Questions Long Answer Type

Question 1.
What do you know about cell?
Answer:
Just like buildings are made of bricks, the bodies of living organisms are made of tiny units called cells. A cell can be Jefined as the structural and functional unit of the living organisms. Cells can be seen under the microscope. Some organisms are made of only one cell.

The cell is enclosed by a thin outer boundary, called the cell membrane, Most cells have a distinct, centrally located spherical structure called the nucleus. The nucleus is surrounded by a jelly-like substance called cytoplasm.

Question 2.
If the pitcher plant is green and carries out photosynthesis, then why and how does it feed on insects?
Answer:
The pitcher plant is green and carries out photosynthesis. Thus, it gets its nutrition by this process. But it does not get nitrogen which is required for its growth from the soil in which it grows.

The pitcher plant have pitcher like structures which are the modified parts of the leaves. The apex of the leaf forms a lid which can open and close the mouth of the pitcher. Inside the pitcher are hair which are directed downwards. When an insect lands in the pitcher, the lid closes and the trapped insect gets entangled ir to the hair. The insect is digested by the* digestive juices secreted in the pitcher.

Hope the knowledge provided regarding the Nutrition in Plants Class 7 Extra Questions and Answers has helped you to the possible extent. For more info feel free to reach us and we will guide you at the earliest possibility. Stay connected to our site to avail latest updates on Extra Questions for Various Classes instantly.