The molecules that absorb only certain wavelengths of light energy from the sun to begin the photosynthetic reactions are called . a. chloroplasts. b. stroma. c. oxygen. d. pigments.

Option-(A)- The molecules that absorb only certain wavelengths of light energy from the sun to begin the photosynthetic reactions are called chloroplasts.

Explanation:

The process of photosynthesis initiates when the required amount of sunlight is present to energize the plant cells to reach a level of threshold and start producing the energy required for driving life on this planet. As, the chloroplast is the specialized structure which is comprised of a more complex structures known as gran and they consists of a stack or coins like structure that make up the whole body of the pigment.