Question

In a syncarpous unilocular ovary, ovules develop from two opposite lines on the wall. The placentation is
a. Superficial
b. Marginal
c. Axile
d. Parietal

Answer 1

Hint: Gynoecium is the generally used collective term for the parts of the flower, where the flower produce ovules and they ultimately developed into the fruit and seeds, where this gynoecium is the innermost whorl of the flower, and they also contains pistil and other collective parts and surrounding structures.

Complete answer:
Based on the number of carpels the gynoecium is generally divided into the following types, they are
- Monocarpous: This means that gynoecium contains a single carpel.
- Apocarpous: This means that if gynoecium has multiple distinct free, unfused carpels, it is called apocarpous.
- Syncarpous: This means that if the gynoecium contains the multiple carpels and fused into a single structure it is called syncarpous.

The syncarpous gynoecium can sometimes appear as monocarpous and in the fruits, there are chambers which are generally called locules. Depending on the number of the locules they are divided into unilocular, bilocular, trilocular, and multilocular. These locules of the ovules may or may not be filled with the flesh of the fruit.

Based on the attachment and development of ovules to the parts of the ovary, they are called placentation and they are of the following types. Especially in the bilocular ovules.
They are where seeds grow from the placental areas at the inferior of the ovary and this is called axile placentation. If the placenta is along the margin of the fruit, which means two opposite lines of the walls, where two carpels fuse called parietal placentation.

Hence, the correct answer is option (D).

Note: Based on the position of the ovary they are classified as superior and the inferior, and if the ovary present above the receptacle, it is called as superior, and if it is embedded in the ovary it is called as half inferior, and if it is below the receptacle it is called as inferior.