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Photosynthesis in Higher Plants
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Solution:
Chloroplast movement is influenced by light exposure.
Light-induced changes in the cellular distribution or
orientation of chloroplasts have been observed in nearly
all green plants including algae, mosses, ferns, and
angiosperms. Under low light conditions, chloroplasts
accumulate along the cell walls that are perpendicular to
the incident light. Under high light conditions, they
accumulate along the walls that are parallel to the incident
light. These are the regions of plant leaf cells where internal
fluence rates of light are the highest and lowest,
respectively and it is believed likely that the light-induced
chloroplast movements serve an adaptive function.