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प्रश्न
Describe the structure of its microsporangium.
उत्तर
A microsporangium is a cylindrical sac which appears circular in the transverse section. It contains the following parts:
(1) Outer wall
(2) Central homogeneous sporogenous tissue
(3) Epidermis
(4) Endothecium
(5) 1–3 middle layers and tapetum
The outer three layers perform the function of protection in the younger anther andthe mechanism of dehiscence in the ripe anther.The endothecial cells develop fibrous thickening of α-cellulose on the inner and radial walls and die. The innermost layer is called the tapetum. It nourishes the developing pollen grain.
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संबंधित प्रश्न
Lever mechanism of pollination is observed in
- Salvia
- Jasmine
- Bougainvillea
- Butea
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Name the part of the flower which the tassels of the corn- cob represent.
Give the floral adaptations for anemophily.
What is meant by pollination?
Which one of the following is one of the characteristics of self-pollinated flowers?
At which stage pollen grains are shed from the anther in Angiosperms?
Which of these is a condition that makes flowers invariably autogamous?
Describe any three adaptations in anemophilous flowers.
Briefly discuss any two methods by which plants avoid self-pollination.
