A photosynthetic unit consists of :

Option D

A photosynthetic unit consists of About 400 light harvesting chlorophyll molecules and trapping center. The photosynthetic unit is a complex of pigments and proteins coupled to a reaction center where the initial light-driven charge separation of photosynthetic reactions takes place. The ‘size’ of the photosynthetic unit is defined as the number of light-absorbing pigment molecules contributing excitation energy to a reaction center.