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प्रश्न
Describe the structure of its microsporangium.
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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
Mention two strategies that evolved to prevent self-pollination in flowers.
The transfer of pollen grains from the anther to the stigma of the same or of another flower of the same kind is known as ______.
Complete the following chart and rewrite.
| Sr.No. | Agencies | type of pollination |
| 1 | Water | .................... |
| 2 | ........................... | Entomophily |
| 3 | Bat | .................... |
| 4 | ....................... | Ornithophily |
(Or)
Explain outbreeding devices in angiospermic plants.
Give four adaptations shown by flowers pollinated by wind.
Mention various adaptations for wind pollination.
Cleistogamous flowers are ______.
The flower which possesses both androecium and gynoecium is called perfect or ______.
Describe any three adaptations in anemophilous flowers.
Which of the following floral adapation are adapted by hydrophilous flowers?
Which one of the following flower is hypohydrophilous?
