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Answer: To solve this question, we first need to understand what placentation is and what parietal placentation means. Placentation refers to the arrangement of ovules inside the ovary of a flower. The type of placentation affects how seeds are arranged in the fruit. There are different types, like:
- Marginal (found in legumes)
- Axile (found in tomato and lemon)
- Parietal (our focus here)
- Free central, etc.
What is Parietal Placentation?
In parietal placentation, the ovules are attached to the inner wall of the ovary or to extensions of it. The ovary is usually unilocular (having a single chamber), and the placenta is located on the inner wall.
Now, let’s look at the Options and analyse each to find the correct option:
(A) Brassicaceae
Yes, plants in this family, like mustard, show parietal placentation. The ovary is unilocular at first, and the ovules are attached to the ovary wall. Later, a false septum (partition) may form, making it look bilocular (two chambers), but originally it’s unilocular with parietal placentation.
(B) Asteraceae
This is also known as the Sunflower Family. This family usually shows basal placentation, where the ovules are attached at the base of the ovary. The ovary is unilocular, but the ovule attachment is different.
(C) Solanaceae
This family includes tomato, potato, and brinjal. Solanaceae typically exhibit axile placentation, where the ovules are attached to a central axis, and the ovary is divided into multiple chambers (multilocular).
(D) Liliaceae
Members of this family (like lily) also have axile placentation, not parietal. The ovary has multiple chambers with ovules attached to a central axis.
Correct Answer: (A) Brassicaceae
So to understand this in a better way, if the ovules are stuck to the walls inside the ovary, not in the centre, it’s called parietal placentation. Mustard (Brassicaceae) is a common example. It starts with one chamber and later may look like it has two. That’s why option (a) Brassicaceae is correct.
Common Doubts of Biology:
