Three test tubes are set up as shown in the diagram. Observe the diagram carefully and answer the following questions. a. Which test tube will have the most carbon dioxide after three hours? b. If test tube C is placed in the dark for three days, what will happen to the fish?

a. Test tube A has the most carbon dioxide as it contains only the fish. The fish take in the oxygen present in the water and release carbon dioxide during breathing. In test tube C, the carbon dioxide released by the fish will e absorbed by the plants to make their food. In test-tube B all the carbon dioxide will be absorbed by the plants. Hence, test tube A has the most carbon dioxide after three hours. b. The fish may die if it is kept in the dark for three days. Test tube C contains plants and fish. Plants cannot make their food in the dark due to the lack of sunlight. So, plants do not absorb carbon dioxide released by the fish and release oxygen, hence the amount of carbon dioxide will be more. The amount of oxygen will also be less, this leads to an unfavourable condition for a fish to live.

E M B I B E

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q D

MEDIUM

4th CBSE

IMPORTANT

Earn 100

Write three functions of leaf.

Important Questions on Making of Food

EASY

4th CBSE

IMPORTANT

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q D

Draw a well-labelled diagram of a leaf.

MEDIUM

4th CBSE

IMPORTANT

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q D

Describe an experiment to show that the sunlight is essential for photosynthesis?

EASY

4th CBSE

IMPORTANT

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q 1

How does a cactus plant make food when all its leaves have changed into spines?

MEDIUM

4th CBSE

IMPORTANT

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q 2

There is a forest with many deer and very few tigers. One year scanty rainfall occurred in the forest, followed by severe, drought. This resulted in the drying up of all grasses, plants, and, trees. Can you foresight what will happen to the deer, tigers, and other animals in the forest?

MEDIUM

4th CBSE

IMPORTANT

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q 1

Rishu read an article on the loss of habitat of animals due to the cutting down of trees in the forest. He read that animals are becoming endangered as a result of the destruction of their homes. He is in a worry as a park nearby to his place, visited by many migratory birds in winter, is purposed to be converted into a parking area. This will destroy plants and thereby the homes of birds. How should he convince the authority to not build a parking area over the park?

EASY

4th CBSE

IMPORTANT

LEARNING SCIENCE FOR SMARTER LIFE,>Chapter 3 - Making of Food>Test Match>Q 1

Three test tubes are set up as shown in the diagram. Observe the diagram carefully and answer the following questions.

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