Identify the labelled part $X, Y$ and $Z$ from the given figure :

$X-Y-Z$

Definations / Explanation :

$1.$ Embryo sac

$2.$ Monosporic development

Select the correct option

Definations / Explanation :

$1.$ Nucellus

$2.$ Funicle

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