Which one of the following is an example of cleistogamy

Cleistogamy occurs in which plant ?

Xenogamy or cross-pollination is performed by

$I$. Abiotic agencies

$II$. Biotic agencies

$III$. Insects only

Select the correct option for the given question

Which of the following statement is applicable for all flowering plants?

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.

Geitonogamy involves