Crop rotation is used by farmers to increase

Select the correct match for $X$ and $Y$:

Column $X$	Column $Y$
$(1)$ Worker	$(P)$ Sterile female
$(2)$ Queen	$(Q)$ Fertile female
$(3)$ Drone	$(R)$ Fertile male
$(4)$ Hilsa	$(S)$ Edible marine fish

Consider the following statements:
$I$. Semen is preserved for artificial insemination by heating.
$II$. The most common bee species reared in India is $Apis$ $indica$.
$III$. An example of interspecific hybridization is a mule.
Which of the statements given above is/are not correct?

Which of the following is a pheromone?

During the period $1960$ to $2000$,wheat production increased from $.....X......$ million tonnes to $.....Y......$ million tonnes.

Identify the mismatched pair: