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questions :Distribution of chloroplast
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[Member (365WT)]answers [Chinese ]Time :2019-09-23
Chloroplasts are distributed in the cytoplasm, but not all cells, structure determines function, function reflects structure. Chloroplasts are stems, buds, leaves, etc. of green plants. They require chloroplasts for photosynthesis, but not for photosynthesis. There must be chloroplasts, such as cyanobacteria, which have no chloroplasts and chlorophyll. Photosynthesis depends on cyanoplasmic phycocyanin and some related enzymes; while mitochondria are distributed in cells that undergo aerobic respiration, but not all Aerobic respiration cells have mitochondria, such as aerobic bacteria, which are only ribosomes, but because of the enzymes required for aerobic respiration in the cytoplasm, they can also perform aerobic respiration.
Chloroplasts are present in areas where photosynthesis can occur.

For example: mesophyll cells, tender stem epidermal cells, etc., there is no chloroplast in the root cells.

In higher plants, the chloroplast is a biconvex or plano-convex lens with a long diameter of 5~10um, a short diameter of 2~4um and a thickness of 2~3um. The mesophyll cells of higher plants generally contain 50-200 chloroplasts, which can account for 40% of the cytoplasm. The number of chloroplasts depends on the species cell type and ecological environment.

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