Question

All animals and human beings are directly or indirectly depend on plants for __________.

• A. Food.
• B. Oxygen
• C. Both food and Oxygen
• D. Petroleum product

Answer 1

The correct option is C

Both food and Oxygen

The correct option is C.
Explanation of the correct option:

1. Animals and human beings cannot prepare their food so they depend upon plants for nourishment. They are known as heterotrophs.
2. Plants are known as producers as they can prepare their food through the process of photosynthesis.
3. Photosynthesis is the process by which green plants synthesise their food with the help of water, carbon dioxide and sunlight.
4. During the process of photosynthesis, plants release oxygen that supports different life forms on the earth.

Final answer:
All animals and human beings directly or indirectly depend on plants for food and oxygen.