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A polygonum type of embryosac is -
- a)7-celled and 8 nucleate
- b)8-celled and 7-nucleate
- c)7-celled and 7-nucleate
- d)8-celled and 8-nucleate
Correct answer is option 'A'. Can you explain this answer?
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A polygonum type of embryosac is -a)7-celled and 8 nucleateb)8-celled ...
Polygonum type of embryosac:
The Polygonum type of embryosac refers to a specific type of female gametophyte found in plants. It is characterized by its structure and organization of cells and nuclei. Let's examine the characteristics of the Polygonum type of embryosac in detail:
1. Number of cells:
The embryosac in the Polygonum type is composed of seven cells.
2. Number of nuclei:
The embryosac in the Polygonum type contains eight nuclei.
3. Distribution of nuclei:
Among the eight nuclei present, one is the egg cell, located at the micropylar end of the sac. The remaining seven nuclei are located in the central part of the sac.
4. Cellular organization:
The seven cells within the embryosac are arranged in a specific pattern. They include:
- Three antipodal cells: These cells are located at the chalazal end of the embryosac.
- Two synergid cells: These cells are located near the egg cell at the micropylar end.
- One egg cell: This is the female gamete and is located at the micropylar end.
- One central cell: This cell contains two polar nuclei and is located in the center of the embryosac.
Therefore, the correct answer is option A: 7-celled and 8-nucleate.
The Polygonum type of embryosac refers to a specific type of female gametophyte found in plants. It is characterized by its structure and organization of cells and nuclei. Let's examine the characteristics of the Polygonum type of embryosac in detail:
1. Number of cells:
The embryosac in the Polygonum type is composed of seven cells.
2. Number of nuclei:
The embryosac in the Polygonum type contains eight nuclei.
3. Distribution of nuclei:
Among the eight nuclei present, one is the egg cell, located at the micropylar end of the sac. The remaining seven nuclei are located in the central part of the sac.
4. Cellular organization:
The seven cells within the embryosac are arranged in a specific pattern. They include:
- Three antipodal cells: These cells are located at the chalazal end of the embryosac.
- Two synergid cells: These cells are located near the egg cell at the micropylar end.
- One egg cell: This is the female gamete and is located at the micropylar end.
- One central cell: This cell contains two polar nuclei and is located in the center of the embryosac.
Therefore, the correct answer is option A: 7-celled and 8-nucleate.
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