Answer: Option A. -> True
:
A
A rapid increase in height, referred to as a growth spurt, usually accompanies puberty.The growth spurt characteristically occurs earlier in girls than in boys, with girls having the growth spurt approximately two years prior to boys, on average. In girls, the growth spurt typically slows down by the onset of menstruation. Hence, growth of girls stops earlier than boys.

Answer: Option A. -> One pair
:
A
Humans have 46 chromosomes i.e. 23 pairs of chromosomes in all cells except for the gametic cells (sperm and ova). 22 of these pairs are called autosomes and look the same in both males and females. The 23rd pair called sex chromosomes, differ in males and females. Females have two copies of the X chromosome (XX), while males have one X and one Y chromosome (XY). Thus all non-gametic cells have 2 sex chromosomes in them.

Answer: Option B. -> A proper diet is needed for the rapid growth taking place during adolescence.
:
B
Adolescence is a very important phase for an individual as maximum growth takes place during this phase. If an individual does not receive proper diet during this crucial period, his/her development might be hampered.

Answer: Option A. -> One
:
A
A human cell has 46 chromosomes in total. Out of these 46 chromosomes, 44 are autosomes and 2 are sex chromosomes. Chromosomes occur in pairs and thus there are 23 pairs. A cell having 23 pairs of the chromosome is called diploid. Diploid cells undergo division and their number reduces to half, i.e.produce haploid cells having only 23 chromosomes, without any pairs. These cells are also called gametes. Thus, gametes have only one sex chromosome.

Answer: Option A. -> 11 to 13 years
:
A
Puberty is the period during which girls and boys become capable of reproduction. Puberty in girls is most commonly observed when they are about 11 to 13years old.

Answer: Option B. -> False
:
B
The sex chromosome pair in males has one X and one Y chromosome. Thus, whenmale gametes, i.e., sperms are formed,50% would contain aX chromosome and the other 50% would contain a Y chromosome.

Answer: Option B. -> HIV
:
B
AIDS is caused by the Human Immunodeficiency Virus (HIV) virus. HIV passes from an infected person to a normal person throughsexual contact, sharing syringes, breast feeding etc.

Answer: Option A. -> True
:
A

The human body undergoes several changes during adolescence. These changes mark the onset of puberty. Puberty ends when an adolescent reaches reproductive maturity. The most conspicuous change during puberty is the sudden increase in height. At this time the bones of the arms and the legs elongate and make a person tall and the growth in the limbs usually happens first. The growth spurt characteristically occurs earlier in girls than in boys.

Answer: Option B. -> False
:
B

The sex chromosome pair in females consists of 2 X chromosomes. Hence, during egg formation, when the chromosome number is halved, all female gametes (egg) will receive the X chromosome. Males have one X and one Y in their sex chromosome pair. Therefore, the sex of the child depends on which sperm (X or Y) combines with the egg (X).

Answer: Option D. -> ovulation
:
D

Ovulation is the process in which mature ovaries release egg cell or the ovum. Usually, a single egg is produced during an ovulation cycle. The female hormone, oestrogen is released by the ovaries which promotes ovulation.