In which type of plants is the senescent phase not clearly defined?

Study the following statements.
$I$. Pollen grains of many species cause severe allergies and bronchial afflictions in some people,often leading to chronic respiratory disorders.
$II$. Pollen grains are rich in nutrients.
$III$. Carrot grass came into India as a contaminant with imported wheat.

Which one of the following statements is not true?

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

Choose the correct option regarding gametes.

Identify each part in a flowering plant and write whether it is haploid $(n)$ or diploid $(2n)$.
$(a)$ Ovary . . . . . .
$(b)$ Anther . . . . . .
$(c)$ Egg . . . . . .
$(d)$ Pollen . . . . . .
$(e)$ Male gamete . . . . . .
$(f)$ Zygote . . . . . .