Question

Which colour of light is mostly absorbed by chlorophyll a?

A. Green

B. Yellow

C. Blue

D. InfraRed

Answer 1

Hint: Chloroplast is organelle, present in plant cells, specialized in the food making organisms. They have photosynthetic pigments where the whole process of capturing light and energy takes place. This organelle was discovered by Sachs. Chloroplasts are oval disc-shaped and have a green colour which differentiates them from other plastids.

Complete answer:

The main pigment of the photosynthesis process is the chlorophyll, which is responsible for the making of food. But with the chlorophyll, there are other thylakoid pigments which also play some important roles.

Chlorophyll a directly participates in the photosynthesis process. It is a part of oxygenic photosynthesis. It absorbs energy from the red and blue light. It provides a green colour to the leaves by reflecting green-yellow light. Chlorophyll does not absorb green, yellow or Inferred Colour. The photosynthesis is maximum in red light, not the absorbance.

Hence the correct answer is Option (C), Blue.

Note: Chlorophyll b is the accessory pigment which will transfer the light to the chlorophyll a. It is bonded to the porphyrin functional group. Phycobilins are the light-harvesting pigments. They absorb the red, green and yellow colour wavelengths, which are not absorbed well by the chlorophyll a.