Which one of the following pairs of plant structures has a haploid $(n)$ number of chromosomes?

An $8$-nucleate embryo sac is $..........$.

Which one of the following statements is not true?

In haploid organisms that undergo sexual reproduction,name the stage in the life cycle when meiosis occurs. Give reasons for your answer.

If a stem has $2n = 10$ chromosomes,find out the number of chromosomes in:
$A$ - Endosperm
$B$ - Egg cell
$C$ - Polar nuclei

Select the option that represents the correct sequence of events in the process of fertilization in flowering plants:
$(I)$ Movement of male gametes towards the egg cell and central cell
$(II)$ Formation of pollen tube
$(III)$ Dehiscence of anther
$(IV)$ Germination of pollen grain
$(V)$ Fusion of nuclei (Syngamy and Triple Fusion)
$(VI)$ Entry of male gametes into the synergid
$(VII)$ Deposition of compatible pollen on the stigma