Q.

Which one of the following statements is not true                      [2016]

1 Pollen grains of many species cause severe allergies.  
2 Stored pollen in liquid nitrogen can be used in the crop breeding programmes.  
3 Tapetum helps in the dehiscence of anther.  
4 Exine of pollen grains is made up of sporopollenin.  

Ans.

(3)

Tapetum is the innermost wall layer of microsporangium that nourishes developing pollen grains.