NEET (2024 Updated)-National Eligibility cum Entrance Test (Medical) Biology Reproduction-Sexual Reproduction in Flowering Plants Study Material (Page 14 of 26)
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Megasporogenesis
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- During the development of ovule, in the beginning of this process, nucellus develops form the placenta in the form of a small rounded out growth like structure.
- At this stage, all the cells of nucellus are undifferentiated, homogenous and meristematic. This mass of cells surrounded by single celled thick layer of epidermis.
- Any one hypodermal cell of nucellus is differentiated an…
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Development of Embryosac or Female Gametophyte
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- Megagametogenesis: Megaspore is the first cell of the female gametophyte. This megaspore grows in size and obtains nutrition from the nucellus.
- The nucleus of megaspore divides mitotically to form two nuclei. Each nucleus moves towards the opposite pole and reached at their respective poles.
- Both the nuclei lie at poles divide twice mitotically. Result…
… (361 more words, 5 figures) …
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