Multiple choice

Directions: The question consists of two statements: Assertion and Reason. While answering this question, you are required to choose any one of the following five responses.

(A) If both Assertion and Reason are true and Reason is the correct explanation of Assertion; (B) If both Assertion and Reason are true but Reason is not the correct explanation of Assertion; (C) If Assertion is true but Reason is false; (D) If Assertion is false but Reason is true; (E) If both Assertion and Reason are false.

Assertion (A): Both blue and red lights are used directly for light reactions of photosynthesis. Reason (R): The absorption spectrum represents the graph plotted between the amount of CO2 consumed and different wavelengths of light absorbed by the same pigment.

  1. (A)

  2. (B)

  3. (C)

  4. (D)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The light that is absorbed the best is blue, so this shows the highest rate of photosynthesis, after which comes red light. Green light cannot be absorbed by the plant, and thus cannot be used for photosynthesis. Chlorophyll looks green because it absorbs red and blue light, making these colours unavailable to be seen by our eyes. It is the green light which is not absorbed that finally reaches our eyes, making the chlorophyll appear green. (e) 

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