Long silky hairs on the cob of maize are:

Discuss with your teacher about:
$(i)$ haploid insects and lower plants where cell-division occurs,and
$(ii)$ some haploid cells in higher plants where cell-division does not occur.

An angiospermic male plant with $24$ chromosomes in its pollen mother cells is crossed with a female plant bearing $24$ chromosomes in its root cells. What would be the ploidy of the embryo and endosperm respectively formed after this cross?

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

$A$: More than one pollen tube can enter an embryo sac.
$R$: Double fertilization can occur by contribution of gametes from different pollen.

Which of the following statements is true regarding $Strobilanthus \; kunthiana$ (Neelakuranji)?