Question

Why is photosynthesis important?

• A. It is the source of energy and food for all organisms.
• B. It releases oxygen into the environment which is utilised by organisms.
• C. It sustains all the food chains in an ecosystem
• D. It releases carbon dioxide into the environment which is utilised by all organisms

Answer 1

Answer: (A), (B), (C)

The correct options are
A It is the source of energy and food for all organisms.
B It releases oxygen into the environment which is utilised by organisms.
C It sustains all the food chains in an ecosystem

Photosynthesis is the source of energy and food for all organisms directly and indirectly. Herbivores depend directly on plants whereas carnivores depend on herbivores which feed on plants. So, it sustains all the food chains in an ecosystem.
During the process of photosynthesis, oxygen is released into the environment, which is utilised by all living organisms. Carbon dioxide is released during respiration and not photosynthesis.