The main parts of a plant involved in photosynthesis are:

1. Leaves:

   • The leaves contain specialized structures called chloroplasts, which contain chlorophyll – the pigment that absorbs sunlight.
   • The leaf surface also has small pores called stomata, which allow the exchange of gases (CO2 and O2) during photosynthesis.

2. Stems:

   • The stems transport water and minerals from the roots to the leaves.
   • They also transport the products of photosynthesis (glucose) from the leaves to the rest of the plant.

3. Roots:

   • The roots absorb water and minerals from the soil, which are necessary for the photosynthesis process in the leaves.

4. Chloroplasts:

   • These are the organelles within the leaf cells that contain chlorophyll and are the site of the light-dependent reactions of photosynthesis.

So in summary, the main plant parts involved in photosynthesis are the leaves, stems, and roots, with the chloroplasts within the leaf cells being the key structures where the photosynthesis reactions take place.