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Question
The wall layer of microsporangium, which nourishes the pollen grain, is ______.
Options
epidermis
endothecium
middle layers
tapetum
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Solution
The wall layer of microsporangium, which nourishes the pollen grain is tapetum.
Explanation:
- The microsporangium, or pollen sac, is the portion of the anther where microspores are formed. The pollen sac wall is composed of four layers: epidermis, endothecium, middle layers, and tapetum.
- The innermost layer, the tapetum, is composed of multinucleated cells with thick cytoplasm and reserve food resources.
- The epidermis, endothecium, and middle layers are the other three wall layers that surround it. It nourishes the growing microspores or pollen grains.
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