Important Questions: Reaching the Age of Adolescence - Class 8 MCQ

Girls reach puberty earlier than boys. In girls, adolescence may begin a year or two earlier than in boys.

Growth is the process in which the size of an individual increases permanently from the zygote stage to the adult stage. The first three years is the infancy period, followed by childhood. Adolescence begins around the age 11 and lasts upto 18 or 19 years of age.

The period after childhood is that of the adolescence. It begins around the age of 11 and lasts upto 18 or 19 years of age.

Growth takes place by cell division. During infancy growth rate is very fast. Growth slows down during childhood (3-11 years) and during adolescence very rapid growth occurs.

At the beginning of adulthood, the growth is maximum.

The testes produce male gametes called sperms which fertilize the egg to form a zygote.

Hormones are chemical substances. The changes which occur at adolescence are controlled by hormones. Testosterone is the male hormone. Oestrogen and progesterone are the female hormones.

The onset of puberty brings about the growth of the reproductive organs. In girls, production of egg cells and menstruation, growth of pubic hair and armpit hair, enlargement of breasts and buttocks take place during adolescence.

The release of the egg cell is called ovulation. During menstrual cycle, 13th to 15th day after menstruation, an egg cell is most likely to be released from an ovary.

Girls reach puberty earlier than boys and they overtake boys in height during adolescence.

The human body undergoes several changes during adolescence. These changes mark the onset of puberty. During puberty, secondary sexual characteristics develop. Girls reach puberty earlier than boys.

Adolescence is a stage of rapid growth and development. Hence, a balanced diet rich in proteins is essential.

Deepening of voice is a secondary sexual characteristic of a boy.

During puberty, physical and emotional changes take place in the adolescents. These changes are called secondary sexual characteristics.

During menopause, the menstrual cycle stops. It is likely to occur when a woman is about 45 to 50 years old.

Ovulation take place in the 14th day of menstrual cycle, it does not occur in the final stage
Ovulation typically happens around day 14 of a 28-day menstrual cycle. However, not everyone has a textbook 28-day cycle, so the exact timing can vary. In general, ovulation occurs in the four days before or four days after your cycle's midpoint.

Adrenaline hormone is secreted by the adrenal cortex of kidney.

The changes which occur at adolescence are controlled by sex hormones. The male hormone or testosterone controls the development of male secondary sexual characteristics.  

Thyroxine is secreted by the thyroid gland. Metamorphosis in insects is controlled by thyroxine.

Chromosomes concerned with sex are called allosomes or sex chromosomes. They are XX in female and XY in male.