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Model Paper 3 — BIOLOGY STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceBIOLOGYModel Paper 32 Marks
Question
Describe internal structure of microsporangiums.
✓

Answer

Structure of microsporangiums : In a transverse section, a typical microsporangiums neat circular is outline.
$\rightarrow$ It's generally surrounded by four wall layers - the epidermis, endothecium, middle layers and tapetums.
$\rightarrow$ The outer three wall layers perform the fraction of protection and help in dehiscence of anther to release the pollen.
$\rightarrow$ The innermost wall layer is the tapetum.
$\rightarrow$ It nourishes the developing pollen grain.
$\rightarrow$ Cells of the tapetum possess dense cytoplasm and generally have more than one nucleus.
$\rightarrow$ When the anther is young, a group of compactly arranged homogenous cells called the sporogenous tissue occupies the centre of each microsporangiums.

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