Which among the following take part in the process of photosynthesis?

The correct answer is Option (3) – CO₂ and H₂O

Carbon and energy requirements of the autotrophic organism are fulfilled by photosynthesis.

It is the process by which autotrophs take in substances from the outside and convert them into stored forms of energy. This material is taken in the form of carbon dioxide and water which is converted into carbohydrates in the presence of sunlight and chlorophyll.