Which of the following is not required in photosynthesis?
a. chlorophyll
b. Light
c. CO2
d. O2

Which of the following statements does not justify the importance of photosynthesis?
1. it is the primary source of all food on earth.
2. it is responsible for the release of oxygen into the atmosphere.
3. it is responsible for the water balance on earth.
4. use of energy from sunlight by plants doing photosynthesis is the basis of life on earth.

Photosynthesis is a-
a. Biochemical process
b. Physical process
c. Chemical process
d. Physico-chemical process