Question

Thalamus in the hypogynous ovary is?
A: convex
B: concave
C: Flat
D: Partly cup size

Answer 1

Hint: The thalamus is the thickened part of a stem (pedicel) from which the flower organs grow. It usually provides nutrients to the flower. Thalamus is a modified stem that possesses nodes and internodes. The shape of the thalamus depends on the position of the ovary. In hypogynous flowers, the ovary is superior and the thalamus is convex or swollen.

Complete answer:
OptionA:-convex
The vary is situated in the highest position of the thalamus all the other parts are present below it. Whorls remaining inserted below the pistil one after another Example china rose and Datura.

OptionB:concave
The ovary is situated at the lowest position and rests floral parts are above it, the ovary is said to be inferior. Example pea and roses.

OptionC: flat
Flower whorls are arranged at the rim of the thalamus. Seen in perigynous flowers Thalamus is disc like.

OptionD: partly cup size
The gynoecium is situated in the centre of the thalamus and ovary is completely free from the thalamus. Other floral parts rise from the rim of the thalamus. example in roses.

So, the Correct option is A- convex.

Note: Thalamus is convex and doomed shape in hypogynous flowers where semen, petals and sepals are placed above the pistil. Ovary here is called superior. Hypogynous ovary looks convex as the floral parts are present below the thalamus. They are found in many flowers one of the examples is Rose.