Which one of the following is not a correct explanation of cross-pollination?
The pollen grains are transferred from one flower to another flower situated on the same plant
The pollen grains are transferred from one flower to another flower, of another plant the same species
both $a$ and $b$
The pollen grains of the flower are transferred to the stigma of the same flower
Sperm cells of angiosperms differ from the rest of the plant groups like gymnosperms by
Which are characters of insect pollinated flowers ?
Cleistogamy occurs in which plant ?
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.
Which one of the following plants shows a very close relationship with a species of moth, where none of the two can complete its life cycle without the other?