Placentation in a syncarpous, unilocular ovary bearing two or more placentae longitudinally along the wall is calleda)Apicalb)Parietalc)Axiled)MarginalCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Answer

Parietal - A syncarpous, unilocular ovary bears two or more placentae longitudinally along the wall. for example Damaris, viola. a false septum or replum occurs between two parietal placentae in mustard. it makes ovary falsely bilocular.

Answer

Placentation refers to the arrangement of ovules within the ovary of a flower. It determines the structure and location of the placenta, which is the region of the ovary where the ovules are attached. Placentation can vary in different types of flowers, and it is an important characteristic used to classify plants.

In the given question, the type of placentation described is 'parietal placentation.' Let's understand what this term means:

Parietal Placentation:
- Parietal placentation is a type of placentation where the ovules are borne on the inner wall or periphery of the ovary.
- In this type of placentation, the ovary is unilocular, meaning it has a single chamber or compartment.
- The ovules are attached to the ovary wall at multiple points, forming two or more placentae that run longitudinally along the wall.
- The placentae can be arranged in various patterns, such as parallel lines or in a central column.

Comparison with Other Types:
- Apical placentation: In apical placentation, the ovules are attached to the apex or top of the ovary. This type is not applicable to the given question.
- Axile placentation: In axile placentation, the ovules are attached to a central column or axis within a multilocular ovary. This type is also not applicable to the given question.
- Marginal placentation: In marginal placentation, the ovules are attached to a single line along the margin or edge of the ovary. This type is not applicable to the given question.

Conclusion:
- Based on the description given in the question, the correct answer is option 'B' which is 'parietal placentation.'
- Parietal placentation is characterized by the presence of two or more placentae that run longitudinally along the wall of a syncarpous, unilocular ovary.
- This type of placentation is commonly found in plants belonging to various families, such as the Malvaceae, Rutaceae, and Violaceae.

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