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Chloroplast distribution in a photosynthesizing cell is governed by blue light sensing phototropin 2 (PHOT2). When the cells are irradiated with high intensity blue light, the chloroplasts
hold as move to the side walls
aggregate in the middle of the cell
are sparsely distributed
aggregate in small clusters
Answers (1)
When photosynthesizing cells are irradiated with high-intensity blue light, the chloroplasts within the cells tend to move towards the side walls. This phenomenon is known as chloroplast avoidance or chloroplast positioning response.
The movement of chloroplasts in response to light is regulated by photoreceptor proteins, such as phototropins. In particular, phototropin 2 (PHOT2) is involved in blue light sensing and the regulation of chloroplast movement. Hence, the correct answer is option 1.
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