Question

which is the Correct ...In which type of flowers the pollen grain are ribbon like without exine

a)Anemophilous
b)epihydrophiloue
c)hypohydrophilous
d)entomophilous​

Answer 1

Thread like pollen are found in Hydrophily where pollination occurs by means of water. Such pollen grains sometimes lack exine and form thread-like structures called the viscin threads. These structures aid the pollen to swim in water and thus, pollination can occur when they come in contact with a female flower.

Answer 2

In HYPOHYDROPHILOUS types of flowers, the pollen grains are ribbon-like without exine. (OPTION C)

HYPOHYDROPHILOUS -

• The Pollination process that takes place underwater is known as hydrophily.
• Pollination in submerged plants is referred to as hypohydrophily.
• The male flowers dehisce on the surface of water releasing pollen grains.
• Pollen grains are pollinated by the means of water current.
• Pollen grains sink in water and reach the female flowers.
• The pollination takes place underwater facilitating the process of reproduction.
• Example - Ceratophyllum

Hypohydrophilous types of flowers have pollen grains that are ribbon-like without exine. (OPTION C)