UPSC Civil Services Model Paper 5

Explanation:
Parthenogenesis is a modification of sexual reproduction in which an egg develops into a complete organism without fertilization.
In honey bee, unfertilized eggs development to the male bee which are the drones with the haploid cell, and the fertilized egg give rise to the female Queen bees and worker bees with the diploid cell.
The Queen bee is the largest in size and lays a large number of eggs.
So, Both A and R are true and R is the correct explanation of the A.