Answer :

(a) Common signs of sexual maturity in Boys

(i) Thickening of vocal cords due to which cracks in voice occurs.

(ii) Initiation of sperm production.

Common signs of sexual maturity in Girls-

(i) Shrillness in voice

(ii) Initiation of ovulation and menstruation.

(b) Decline in the Female to Male Sex Ratio; Gender Disbalance

(c) Oral Contraceptive Pills (OCP)

(d) The rate of birth and death in a given population determines the size of a population.

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