Question

A yellow sticky substance present on the surface of entomophilous pollen grains is
a- sporopollenin
b- lingo suberin
c- pollen kit
d- mucopolysaccharides

Answer 1

Hint: Entomophilous plants are pollinated by insects. A yellow sticky substance is present around the pollen grains which help in insect pollination. Plants and insects both benefited from this relationship. Through insects pollen of flowers reached to another flower and from the flower insect gained a source of food nectar.

Complete Answer:
A- The first option is sporopollenin. It forms an outer wall around pollen grains and spores. It protects the pollen grains from outer damage like rain and high temperature. It reduces dehydration. It makes spores less dense by which spores disperse.

B- Option b is lingo suberin. Lingo-suberised are thickening in the endodermal cells. It is present on the radial and tangential cell walls which are called casparian strips.

C- Option c is pollen kit. Pollen kits are generally found in entomophilous plants. Pollen kit is the stick material present around the pollen grain of all insect pollinated plants. This stick material holds pollen grains in the anther. It protects the pollen grains during lakes of water and from ultra radiation . during transportation it keeps the pollen grains together. It helps to make the pollen grains attractive for insects. Entomophilous flowers are mostly pollinated through bees. So from the above description it is clear that a pollen kit is the right option.

D- Option d is polysaccharide which is a large molecule made by small monosaccharides like sugar and glucose.

Hence the correct answer is option C.

Note: Generally flowers of entomophilous plants are bright coloured and scented to attract the insects through which the process of insect pollination can be done.