Question

Compound pollen grains occurs in
A) Calotropis asclepias
B) Orchids
C) Juncus or cryptostegia
D) Brassica

Answer 1

If four pollen of tetrad joins together permanently, they are called “compound pollen” and they occur in more than 56 families of angiosperms. If microspores are not separated from the tetrads into individual pollen grains then compound pollen grains are formed.

Complete answer:
To answer this question you must know about plants that have compound leaves. Pollen grains are produced by the flower on the anther part of the stamen. Bees will transport the pollen grain either accidentally or intentionally. It has been seen that Most of the Angiosperm families exhibit this type of Pollens.

- In calotropis Asclepias the pollen are enclosed in pollinia (a coherent mass of pollen grains) but tetrad is not join permanently.
- In Juncus or cryptostegia the microspores do not separate from each other and hence it forms compound pollen grains because Tetrad is joint permanently.
- In orchids the various pollen dispersal units (PDU) do not have compound pollen grains because tetrads are easily separated from each other.
- Brassica is a genus of plants in the cabbage and mustard family in which tetrad is not joined permanently hence pollen grains can easily separate from each other.

Here, only juncus and cryptostegia have compound pollen grain therefore ,the correct option is (C).

Note: Pollen grains of some plants present in the air cause allergy are called “aeroallergens' '. Since Pollen grains of many plants are rich in nutrients, in recent years the pollen grain used in making tablets as food supplements. Sometimes it has been claimed that consumption of pollen grains increases the performance of athletes and racehorses.