Question

In shade plants the ratio of chl a: chl b is

• A. 4.5 :1
• B. 1.4:1
• C. 0.7 : 1
• D. 5.5 : 1

Answer 1

The correct option is B 1.4:1

Chlorophyll a is the site of photochemical reaction. It absorbs light required for photosynthesis. It is the primary photosynthetic pigment. Chlorophyll b supplies more light energy to chlorophyll a. It is accessory pigment. However, chlorophyll b is more adaptive to stress condition. In absence of light or in shade when chlorophyll a fails to absorb energy, chlorophyll b carries out the function. The ratio of chlorophyll a to b is generally 3:1. However, in shade plants, the ratio is reduced to 1.4:1.

Thus, the correct answer is option B.