Read the passage given below and answer the following questions from (i) to (v).
Sexual reproduction is the most common method of reproduction in animals and plants. One male and one female parent are involved in the process of sexual reproduction. Sexual reproduction involves fusion of two types of reproductive cells known as gametes to form a single cell called zygote. The zygote multiplies repeatedly and undergoes specific changes to form a new individual.
(v) As the rate of general body growth begins to slow down, reproductive tissues begin to mature. This period during adolescence is known as:
(1)