Question

Assertion (A): Photosynthesis is more efficient in red and blue light compared to green light.

Reason (R): Chlorophyll absorbs red and blue light most effectively.

Options

• Both A and R are true and R is the correct explanation of A.

• Both A and R are true but R is not the correct explanation of A.

• A is true but R is false.

• A is false but R is true.

Answer 1

Both A and R are true and R is the correct explanation of A.

Explanation:

The assertion is true because the rate of photosynthesis is significantly higher under red and blue light wavelengths compared to green light, which is largely reflected by plants. The reason is also correct because the primary photosynthetic pigments, such as chlorophyll a and b, have absorption spectra that peak sharply in the blue and red regions. Because the pigments capture this light most effectively, more energy is available to drive the photochemical reactions of photosynthesis.