Question

Q. Which of the following processes add carbon dioxide to the carbon cycle on Earth?

Select the correct answer using the code given below:

• A. 2 and 3 only
• B. 1, 3 and 4 only
• C. 1, 2 and 4 only
• D. 1, 2, 3 and 4

Answer 1

The correct option is B 1, 3 and 4 only

Explanation:

• In the carbon cycle, carbon dioxide moves from the atmosphere to plants. In the atmosphere, carbon is attached to oxygen in a gas called carbon dioxide (CO₂). During the process of photosynthesis, carbon dioxide is absorbed from the air to produce carbohydrates for plant growth. Carbon moves from plants and animals to soils.
• When plants and animals die, their organic matter decay bringing the carbon into the ground. Each time we exhale, we also release carbon dioxide gas (CO₂) into the atmosphere. Animals and plants need to get rid of carbon dioxide gas through a process called respiration.
• Volcanic eruptions release various gases into the atmosphere, primarily water vapour, carbon dioxide and sulphur dioxide.