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From outer to inner, the four wall layers of a typical angiosperm microsporangium are:
ATapetum → Middle layers → Endothecium → Epidermis
BEpidermis → Endothecium → Middle layers → Tapetum
CEndothecium → Epidermis → Tapetum → Middle layers
DMiddle layers → Endothecium → Epidermis → Tapetum
Answer & Solution
Correct answer: B. Epidermis → Endothecium → Middle layers → Tapetum
Outer to inner: **Epidermis → Endothecium → Middle layers → Tapetum**. The outer three are protective and help in dehiscence; the **tapetum** (innermost) nourishes developing pollen grains.
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