Filiform apparatus is a feature of

The megasporangium is attached to the placenta by which structure?

Identify the parts of the pistil labeled as $P$,$Q$,and $R$:
Receptive surface for pollen grains $- P$
Elongated slender part of the pistil $- Q$
Basal swollen part of the pistil $- R$
$\quad\quad\quad\quad P \quad\quad\quad Q \quad\quad\quad R$

The ovule of an angiosperm is technically known as:

In an anatropous ovule,the micropyle is located:

How many meiotic divisions are required for the formation of $100$ functional megaspores?