Question

Which type of placentation is seen in tomato and gurhal?
A. Axile
B. Free central and axile
C. Axile and marginal
D. Marginal basal

Answer 1

Hint: Placentation: The position of ovules with respect to the ovary is known as placentation. The placentations are of different types namely or five types that are marginal, axile, parietal, basal, central and free central. The main function of placentation is the transfer of nutrients as placenta do in humans. It is also used in exchange of gases and also in removal of excretory wastes.

Complete answer:
AXILE:- when the placenta is axial and the Ovules are attached to it in a multilocular ovary, the placentation is said to be axile, as in china rose, tomato and lemon, and gurhal. Thus this option is correct.
Free central and axile: Free central placentation is usually found in dianthus and primrose and axile is found in tomato and gulhar. Hence this option is not correct.
Axile and marginal: axile placentation is found in tomato and gulhar both and marginal is only found in peas. Thus this option is not correct.
Marginal basal :- marginal is found in pea and basal placentation is found in sunflower and marigold and not in tomato. Hence this option is not correct.

Our correct answer is a) axile.

Note: The placentations are of different types namely.
A. Marginal placentation: The placenta forms a ridge along the Ventral suture of the ovary and the ovules are borne on this ridge forming two rows, as in pea.
B. Axile placentation: When the placenta is axial and the Ovules are attached to it in a multilocular ovary, the placentation is said to be axile, as in china rose, tomato and lemon.
C. Parietal placentation: In parietal placentation, the ovules develop on the inner wall of the ovary and sometimes on the peripheral part of ovary. Chambered due to the formation of the false septum, e.g. mustard and Argemone.
D. Free central: When the ovules are borne on the central axis and Septa are absent, as in Dianthus and Primrose.