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STD 12 - 1. sexual reproduction in flowering plants — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 1. sexual reproduction in flowering plants1 Mark
MCQ
Which one of the following statements is correct?
  • A
    Endothecium produces the microspores.
  • ✓
    Tapetum nourishes the developing pollen.
  • C
    Hard outer layer of pollen is called intine.
  • D
    Sporogenous tissue is haploid.
✓

Answer

Correct option: B.
Tapetum nourishes the developing pollen.
b
(b) : A microsporangium is generally surrounded by four wall layers -the epidermis, endothecium, middle layers and the tapetum. The outer three wall layers perfom the function of protection and help in dehiscence of anther to release the pollen. The innermost wall layer is the tapetum. It nourishes the developing pollen grains. Cells of the tapetum are food rich and possess dense cytoplasm and generally have more than one nucleus. They disintegrate to liberate the contents which is absorbed by the developing spores.

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