The main function of a leaf is:

The correct option is C Photosynthesis

• The main function of the leaf is photosynthesis. The whole plant gets food through photosynthesis. The leaves have a photosynthetic pigment chlorophyll, which converts light energy into chemical energy.
• The leaf is also involved in the transpiration process. The transpiration process helps in the cooling of the plant.
• The exchanges of gases take place through stomata present on the leaves.
• Yet, the most important function of a leaf is photosynthesis.

Thus, the correct answer is option C.