An angiospermic plant has $24$ chromosomes in its leaf cells. The number of chromosomes present in the synergid,pollen grain,nucellus,and endosperm will be respectively:

Match the following columns:

Column-$I$	Column-$II$
$(a)$ Zygote	$(1)$ Seed
$(b)$ Ovule	$(2)$ Seed coat
$(c)$ Ovary	$(3)$ Embryo
$(d)$ Integument	$(4)$ Fruit

In which year did the last flowering of Neelakurinji $(Strobilanthes \text{ kunthiana})$ occur?

Non-viable seeds are produced by

Which of the following flowers only once in its life-time?

Given below are two statements:
Statement $I$: Cleistogamous flowers are invariably autogamous.
Statement $II$: Cleistogamy is disadvantageous as there is no chance for cross-pollination.
In the light of the above statements,choose the correct answer from the options given below: