How many times will meiosis take place for the formation of $80$ wheat grains?

An angiospermic plant has $24$ chromosomes in its leaf cells. The number of chromosomes present in the synergid,pollen grain,nucellus,and endosperm will be respectively:

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:

In $Agave$ (Century plant),vegetative propagation occurs through which of the following?

Which of the following statements is incorrect?

Select the incorrect statement from the following.