Question

Observe the given image carefully and answer the following questions.

1. What is shown in the given image?
2. Label the image.
3. Why do plants need carbon dioxide?
4. How is the level of carbon dioxide increased in the atmosphere?
5. Define carbon cycle.
6. How is carbon dioxide added to the atmosphere?
7. How is carbon dioxide removed from the atmosphere?

Answer 1

1. Carbon cycle is shown in the given image.

2.

3. Need for carbon dioxide

• Green plants need carbon dioxide to prepare food by the process called photosynthesis.

4.

• During respiration, human beings, animals and plants release carbon dioxide into the atmosphere.
• Many industrial processes also release carbon dioxide. Volcanic eruptions and decay of plants and animals also contribute to increasing the level of carbon dioxide in the atmosphere.
• The continuous exchange of carbon dioxide in the atmosphere is known as the carbon cycle.

5. Carbon cycle

• Plants use carbon dioxide present in the atmosphere to carry out photosynthesis.
• During respiration, human beings and animals release carbon dioxide into the atmosphere.
• Many industrial processes also release carbon dioxide. Volcanic eruptions and decay of plants and animals also contribute to increasing the level of carbon dioxide in the atmosphere.
• The continuous exchange of carbon dioxide in the atmosphere is known as the carbon cycle.

6. Addition of carbon dioxide to the atmosphere

Carbon dioxide is added to the atmosphere in the following ways,

• By respiration
• By combustion of fossil fuels
• By decomposition of dead plants and animals
• By volcanic eruptions
• By industries

7. Removal of carbon dioxide from the atmosphere

Carbon dioxide is removed from the atmosphere in the following ways,

• By photosynthesis
• By dissolution of carbon dioxide in water when the concentration of gas increases in the atmosphere