The microsporangium has for protection walls and the innermost of these wall layers is tapetum.
Characteristics of the tapetum –
• It nourishes the developing pollen grains.
• Cells of tapetum have a dense cytoplasm and more than one nucleus.
Non-viable pollen grains are seen to develop in a microsporangium where tapetum is damaged or under developed because a damaged or under-developed won’t provide proper nourishment to the developing pollen grains.
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