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From the following, select the process w...

From the following, select the process which take place during the development of embryo sac.
(a.) Functional megaspore divides by three mitotic divisions.
(b.) Type of nuclear division is free , where no cell wall formation takes place.
(c.) Among eight nuclei. Six are surrounded by a cell wall.
(d.) Central cell is situated below the egg apparatus .

A

a and b

B

b and d

C

c and d

D

All are correct

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question regarding the processes that take place during the development of the embryo sac, we will analyze each option provided in the question step by step. ### Step-by-Step Solution: 1. **Understanding the Embryo Sac Development**: - The embryo sac is the female gametophyte found in the ovules of angiosperms (flowering plants). It develops from a functional megaspore through a series of processes. 2. **Analyzing Option (a)**: - **Statement**: "Functional megaspore divides by three mitotic divisions." - **Explanation**: This is correct. The functional megaspore undergoes three mitotic divisions, resulting in eight nuclei (one of which will be the polar nuclei). 3. **Analyzing Option (b)**: - **Statement**: "Type of nuclear division is free, where no cell wall formation takes place." - **Explanation**: This is also correct. During the initial stages of embryo sac development, the divisions are free nuclear divisions, meaning that the nuclei divide without the formation of cell walls. 4. **Analyzing Option (c)**: - **Statement**: "Among eight nuclei, six are surrounded by a cell wall." - **Explanation**: This is correct as well. Out of the eight nuclei formed, six will be surrounded by cell walls, while the two polar nuclei remain free within the central cell. 5. **Analyzing Option (d)**: - **Statement**: "Central cell is situated below the egg apparatus." - **Explanation**: This statement is also correct. The central cell, which contains the polar nuclei, is located below the egg apparatus (which consists of the egg cell and synergids). 6. **Conclusion**: - Since all the provided statements (a, b, c, and d) are correct and describe processes that occur during the development of the embryo sac, the answer to the question is that all options are correct. ### Final Answer: All of the processes mentioned in options (a), (b), (c), and (d) take place during the development of the embryo sac. ---
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