Which plant is shown in the given figure?

In . . . . . . ,pollen grains are long and ribbon-like.

Given below are two statements: One is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$: Both wind and water pollinated flowers are not very colourful and do not produce nectar.
Reason $(R)$: The flowers produce an enormous amount of pollen grains in wind and water pollinated flowers.
In the light of the above statements, choose the correct answer from the options given below:

Which of the following is incorrect with respect to angiosperms?

Give a scientific reason: Variations are expected in sexually reproducing plants.

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