Assertion: The honeybee queen copulates only once in her life time.
Reason: The honeybee queen can lay fertilised as well as unfertilised eggs.

If both assertion and reason are true and reason is the correct explanation of assertion.

If both assertion and reason are true but reason is not the correct explanation of assertion.

If assertion is true but reason is false.

If both assertion and reason are false.

Solution

If both assertion and reason are true but reason is not the correct explanation of assertion.

Queen is the only fertile female in beehive, having immensely developed ovaries. She lives for several successive years laying about 2000 or more eggs a day. The queen has a remarkable capacity of controlling the fertilisation of its eggs. A fertilised egg is laid in a worker or queen cell, while an unfertilised egg in a drone cell, the latter develops parthenogenetically. The queen mates only once in her life time. The sperms stored in her spermatheca fertilise her eggs as long as she lives.