Q.Assertion (A) and Reason (R): A - Head of the sperm consists of acrosome and mitochondria. R - Acrosome contains spiral rows of mitochondria.
a. A and R are true, R is the correct explanation of A
b. A and R are true, R is not the correct explanation of A
c. A is true, R is false
d. Both A and R are false

Gametogenesis is the formation of the male and female gametes, which are always haploid cells. In some algae the two gametes look alike and are called isogametes, but in most organisms they are morphologically distinct heterogametes — a motile sperm (or antherozoid) and a larger, non-motile egg (or ovum). Organisms may be bisexual (monoecious/homothallic), carrying both male and female reproductive structures, as in earthworms or the alga Chara, or unisexual (dioecious/heterothallic), with separate male and female individuals, as in the cockroach or in dioecious plants like papaya and date palm. How the gametes are produced depends on t …