The fourth whorl of a flower is the $......$.

Flowers are unisexual in

The national flower of India is:

Match the placental types (Column-$I$) with their examples (Column-$II$)

Column-$I$	Column-$II$
$(a)$ Basal	$(i)$ Mustard
$(b)$ Axile	$(ii)$ China rose
$(c)$ Parietal	$(iii)$ Dianthus
$(d)$ Free central	$(iv)$ Sunflower

Choose the correct answer from the following options:

In the flowers of a plant,the ovarian part is fused,but styles and stigmas are free. Its ovary becomes unilocular due to breakdown of partition wall and the ovules are attached to a central axis. Identify the plant.

Identify the type of aestivation shown in the given figures $P, Q, R,$ and $S$ and select the correct sequence of plants in which they are found.