Question

Read the assertion and reason carefully to mark the correct option in question.

Assertion: Accessory pigments enable a wider range of wavelength of incoming light to be utilised for photosynthesis.

Reason: Accessory pigments also protect chlorophyll a from photo-oxidation.

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. If both assertion and reason are false.
• C. If assertion is true but the reason is false.
• D. If both assertion and reason are true but the reason is not the correct explanation of the assertion.

Answer 1

The correct option is D If both assertion and reason are true but the reason is not the correct explanation of the assertion.

Assertion reason relation

Chlorophyll a is the major pigment responsible for trapping light and carrying out photosynthesis.

There are other thylakoid pigments like chlorophyll b, xanthophylls and carotenes (xanthophylls and carotenes are types of carotenoids) known by the name of accessory pigments as they are present along with the Chl a.

Accessory pigments also absorb light and transfer the energy to chlorophyll a. This helps in capturing a wider range of wavelength of incoming light to be utilised for photosynthesis. Moreover they also protect chlorophyll a from photo-oxidation.

Final answer

(B) If both assertion and reason are true but the reason is not the correct explanation of the assertion.