Question

Axile placentation is present in
A. Argemone
B. Dianthus
C. Lemon
D. Pea

Answer 1

Hint: Axile placentation can be seen when the ovules are present in and around the center of a compound ovary on an axis which is formed from a joined septa.

Complete Answer:
Placentation can be defined as the arrangement of ovules within the ovary. There are various types of placentation which are found in flowering plants.

Option A: Argemone has parietal placentation and not axial placentation. Therefore, this is the incorrect option. In Argemone, the ovules develop on the inner wall of the ovary.

Option B: Dianthus has free central placentation and not axial placentation. Therefore, this is the incorrect option. In Dianthus, the ovules are present on the central axis.

Option C: Lemon has axial placentation as the ovules are present in and around the center of a compound ovary on an axis which is formed from a joined septa. Therefore, this is the correct option.

Option D: Pea has marginal placentation and not axial placentation. Therefore, this is the incorrect option. In pea, the ovules are seen on the ridge.

Thus, the correct option is C) Lemon.

Note: There are five types of placentation, they are,
Parietal - In this the ovules develop on the inner wall of the ovary or on the periphery. Formation of false septum is seen
(I) Marginal - A ridge is present through the ventral suture of the ovary and the ovules are borne on the ridge.
(II) Axile - The ovules are present in and around the center of a compound ovary on an axis which is formed from a joined septa.
(III )Basal - The placenta develops on the base of the ovary and only one ovary is attached to it.
(IV) Free central - Septa is absent and the ovules are present on the central axis.