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What is the correct sequence of the formation of female gametophyte in angiosperms?
- a)Nucellus, megaspore tetrad, megaspore mother cell, megaspore, female gametophyte
- b)Megaspore tetrad, nucellus, megaspore mother cell, megaspore, female gametophyte
- c)Nucellus, megaspore mother cell, megaspore tetrad, megaspore, female gametophyte
- d)Megaspore mother cell, megaspore tetrad, megaspore, nucellus, female gametophyte
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
What is the correct sequence of the formation of female gametophyte in...
Formation of Female Gametophyte in Angiosperms
The development of the female gametophyte in angiosperms follows a specific sequence, which can be outlined as follows:
1. Nucellus
- The nucellus is the tissue within the ovule that contains the megasporangium.
- It provides nourishment and support for the developing gametophyte.
2. Megaspore Mother Cell
- The megaspore mother cell (megasporocyte) is located within the nucellus.
- This diploid cell undergoes meiosis to produce four haploid megaspores.
3. Megaspore Tetrad
- After meiosis, the four megaspores form a tetrad.
- Typically, three of the megaspores degenerate, leaving one functional megaspore.
4. Megaspore
- The surviving megaspore undergoes mitotic divisions.
- It divides to form the female gametophyte, also known as the embryo sac.
5. Female Gametophyte
- The final structure is the mature female gametophyte, which usually contains seven cells and eight nuclei.
- This structure is crucial for fertilization, as it will eventually form the egg cell, synergids, and polar nuclei.
Conclusion
The correct sequence of formation of the female gametophyte is:
Nucellus → Megaspore Mother Cell → Megaspore Tetrad → Megaspore → Female Gametophyte
Thus, the correct answer is option 'C'. Understanding this sequence is vital for comprehending the reproductive processes in flowering plants, which is essential for NEET aspirants.
The development of the female gametophyte in angiosperms follows a specific sequence, which can be outlined as follows:
1. Nucellus
- The nucellus is the tissue within the ovule that contains the megasporangium.
- It provides nourishment and support for the developing gametophyte.
2. Megaspore Mother Cell
- The megaspore mother cell (megasporocyte) is located within the nucellus.
- This diploid cell undergoes meiosis to produce four haploid megaspores.
3. Megaspore Tetrad
- After meiosis, the four megaspores form a tetrad.
- Typically, three of the megaspores degenerate, leaving one functional megaspore.
4. Megaspore
- The surviving megaspore undergoes mitotic divisions.
- It divides to form the female gametophyte, also known as the embryo sac.
5. Female Gametophyte
- The final structure is the mature female gametophyte, which usually contains seven cells and eight nuclei.
- This structure is crucial for fertilization, as it will eventually form the egg cell, synergids, and polar nuclei.
Conclusion
The correct sequence of formation of the female gametophyte is:
Nucellus → Megaspore Mother Cell → Megaspore Tetrad → Megaspore → Female Gametophyte
Thus, the correct answer is option 'C'. Understanding this sequence is vital for comprehending the reproductive processes in flowering plants, which is essential for NEET aspirants.
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What is the correct sequence of the formation of female gametophyte in...
- Nucellus: The tissue within the ovule where megagametogenesis occurs.
- Megaspore mother cell (Megaspore mother cell): The diploid cell in the nucellus that undergoes meiosis to form a megaspore tetrad.
- Megaspore tetrad: The four haploid megaspores resulting from meiosis of the megaspore mother cell.
- Megaspore: Typically, three of the four megaspores degenerate, leaving one functional megaspore.
- Female gametophyte: The functional megaspore undergoes mitotic divisions to form the female gametophyte (embryo sac).
Thus, the correct sequence is: Nucellus → Megaspore mother cell → Megaspore tetrad → Megaspore → Female gametophyte.
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