Sexual reproduction leads to

Which of the following statements is incorrect?

Match the following columns:

Column-$I$ (Pre-fertilization)	Column-$II$ (Post-fertilization)
$P$. Ovule	$I$. Fruit
$Q$. Ovary	$II$. Seed
$R$. Integument	$III$. Seed coat
$S$. Ovary wall	$IV$. Pericarp

What is the nature of male gametes in angiosperms?

Indicate the stages where meiosis and mitosis occur $(1, 2$ or $3)$ in the flow chart: Megaspore mother cell $\xrightarrow{1}$ Megaspores $\xrightarrow{2}$ Embryo sac $\xrightarrow{3}$ Egg.

Polysiphonous pollen grains are found in........