Polysiphonous pollen grains are found in........

Angiospermic plants are characterised by:
$I.$ Double fertilisation
$II.$ Triploid endosperm
$III.$ Diploid endosperm
Choose the correct option from the following regarding the above statements.

In $Paramecium$,both autogamy and conjugation are considered sexual processes because of:

What is a $Pollen-embryo$?

The chances of hereditary and evolutionary changes are higher in species that reproduce through:

Banana is a parthenocarpic fruit because