Which of the following plant possess the flower on their rhizome ?

In which plants out breeding device prevent autogamy but not geitonogamy?

Identify the set of correct statements:

$A$. The flowers of Vallisneria are colourful and produce nectar.

$B$. The flowers of water lily are not pollinated by water.

$C$. In most of water-pollinated species, the pollen grains are protected from wetting.

$D$. Pollen grains of some hydrophytes are long and ribbon like.

$E$. In some hydrophytes, the pollen grains are carried passively inside water.

Choose the correct answer from the options given below.

Sperm cells of angiosperms differ from the rest of the plant groups like gymnosperms by

This is the only type of pollination which during pollination brings genetically different types of pollen grains of the stigma.

Pollination occurs when a pollen grain