Which of the following statements about photosynthetic pigments is true? A. There is only one kind of chlorophyll. B. Chlorophyll absorbs mostly green light. C. Chlorophyll is required in the Calvin cycle. D. Chlorophyll is found in the membranes of thylakoids. E. P700 is a carotenoid pigment.
The correct statement about photosynthetic pigments is D
The correct statement about photosynthetic pigments is D. Chlorophyll is found in the membranes of thylakoids.
Photosynthetic pigments are molecules that are responsible for capturing light energy during the process of photosynthesis. These pigments play a crucial role in harvesting light energy and converting it into chemical energy that can be used by the plant.
Option A is incorrect because there are several different types of chlorophyll, including chlorophyll a and chlorophyll b. These different types of chlorophyll absorb light at slightly different wavelengths.
Option B is incorrect because chlorophyll absorbs mostly red and blue light, and reflects or transmits green light. This is why plants appear green to our eyes, as the green light is not absorbed but rather reflected.
Option C is incorrect because chlorophyll is not directly required in the Calvin cycle, which is the series of reactions that convert carbon dioxide into glucose during photosynthesis. However, the energy captured by chlorophyll during the light-dependent reactions is used to power the Calvin cycle.
Option E is incorrect because P700 is not a carotenoid pigment. P700 refers to the reaction center chlorophyll in photosystem I, which is responsible for capturing light energy during photosynthesis.
Therefore, the correct statement is that chlorophyll is found in the membranes of thylakoids. Thylakoids are membranous structures found in the chloroplasts of plant cells where the light-dependent reactions of photosynthesis occur. Chlorophyll molecules are embedded in the thylakoid membranes, allowing them to capture light energy and initiate the process of photosynthesis.
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