Which one of the following is an example of cleistogamy
Sunflower
Vallisneria
Commelina
Calatropis
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