Which plant has the longest pollen tube?

$A$ - Endosperm is formed by the primary endosperm cell.
$R$ - Embryo is formed from the zygote.

Is the presence of a large number of chromosomes in an organism a hindrance to sexual reproduction? Justify your answer by giving suitable reasons.

Identify the haploid and diploid structures from the following list:
$I$ - Megaspore mother cell
$II$ - Microspore mother cell
$III$ - Egg cell
$IV$ - Male gamete
$V$ - Synergid
$VI$ - Embryo
$VII$ - Antipodal cell
$VIII$ - Zygote
$IX$ - Megaspore
$X$ - Microspore
Select the correct grouping for Haploid and Diploid structures.

Match the following columns:

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

Which of the following represents the correct sequence of phases in the life cycle of wheat? [where $J$ - Juvenile phase,$R$ - Reproductive phase,$I$ - Interflowering period,$G$ - Gap phase,$S$ - Senescence,$V$ - Vegetative phase]