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The development of microsporangia of an angiosperm is said to be eusporangiate because
Option: 1
Microsporangia develop from a strip of archesporial cell
Option: 2
Microsporangia develop from a single archesporial cell
Option: 3
Microsporangia do not develop from archesporial cell
Option: 4
None of these
Answers (1)
Walls of Microsporangia:
- There are four types of layers in the walls of microsporangia:
- Epidermis
- Endothecium
- 1-3 middle layers
- Tapetum
- The cells of endothecium develop fibrous thickening.
- Between the two microsporangia in one anther lobe, the endothecium is thin-walled and forms the stomium or line of dehiscence of the anther.
- The cells of tapetum are filled with dense protoplasmic content as well as nutrients.
- They may become multinucleated or their nuclei may become polyploid.
- Tapetum can be of two types:
- Amoeboid
- Secretory
- Tapetum nourishes the developing microspore mother cells and pollen grains.
- It produces Ubisch granules that contain sporopollenin for exine formation.
- The microsporangia of angiosperms develop from the strips of archesporial cells, hence the development of microsporangia is eusporangiate. Hence, the correct answer is option a.
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