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

Assertion: Chlorophyll a is the chief pigment associated with photosynthesis.

Reason: In the blue and red regions of spectrum, there is maximum absorption by chlorophyll a, also shows higher rate of photosynthesis.

If assertion is true but the reason is false.

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f both assertion and reason are false.

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

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If both assertion and reason are true and the reason is the correct explanation of the assertion.

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Solution

The correct option is D If both assertion and reason are true and the reason is the correct explanation of the assertion.
Assertion reason relationship

Chlorophyll a, chlorophyll b, xanthophyll, and carotenoids are various pigments involved in photosynthesis. These pigments are part of the photosystems and are present in the chloroplast of plants. Chlorophyll a is the chief pigment associated with photosynthesis because it performs primary reaction of photosynthesis which involves conversion of light into chemical energy.

Assertion reason relationship

The graph shows the absorption spectrum of a mixture of chlorophyll a, chlorophyll b and carotenoids in the range of visible light.

Chlorophyll a show maximum absorption in both red and blue regions.

Final answer

(A) If both assertion and reason are true and the reason is the correct explanation of the assertion.

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Similar questions

Question 53
In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll-a, answer the following

(a) What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.

(b) How can we derive an absorption spectrum for any substance?

(c) If chlorophyll-a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?

Q. Assertion :The colour of the leaf is due to the presence of four pigments-chlorophyll a, chlorophyll b, xanthophylls and carotenoids Reason: Chlorophyll b is the chief pigment associated with photosynthesis

Q. 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.

The absorption and action spectrum of photosynthesis show two maximums, one in the blue region and another in the red. What are the reasons for these?

Q. Assertion :Photosynthesis takes place in all green plants. Reason: Chlorophyll is essential for photosynthesis.

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Light Absorbing Pigments

Standard XII Biology

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Read the assertion and reason carefully to mark the correct option in question. Assertion: Chlorophyll a is the chief pigment associated with photosynthesis. Reason: In the blue and red regions of spectrum, there is maximum absorption by chlorophyll a, also shows higher rate of photosynthesis.

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

Assertion: Chlorophyll a is the chief pigment associated with photosynthesis.

Reason: In the blue and red regions of spectrum, there is maximum absorption by chlorophyll a, also shows higher rate of photosynthesis.