In plants, photosynthesis mainly occurs in the

Leaves
Flowers
Root
Bark

The correct answer is A. Leaves.

Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. The process takes place in the chloroplasts of plant cells, which are found in the leaves.

Flowers are the reproductive organs of plants. They are not involved in photosynthesis.

Roots are the underground parts of plants. They are used to anchor the plant in the soil and absorb water and nutrients.

Bark is the outer layer of a tree. It protects the tree from damage and helps to regulate its temperature.