Bananas are seedless because they

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

Study the following statements.
$I$. Pollen grains of many species cause severe allergies and bronchial afflictions in some people, often leading to chronic respiratory disorders.
$II$. Pollen grains are rich in nutrients.
$III$. Carrot grass ($Parthenium$ $hysterophorus$) came into India as a contaminant with imported wheat.

Provide information about pre-fertilization structures and events in flowering plants.

Pollen grains can be stored for a long period in $......$ at $......$ $^oC$.

The terms $Xenia$ and $Metaxenia$ are related to: