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Important Questions: Reaching the Age of Adolescence


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20 Questions MCQ Test Science Class 8 | Important Questions: Reaching the Age of Adolescence

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Important Questions: Reaching the Age of Adolescence - Question 1

Which of the following statements is true?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 1

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

Important Questions: Reaching the Age of Adolescence - Question 2

Which of the following represents growth periods labelled as P, Q and R?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 2

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.

Important Questions: Reaching the Age of Adolescence - Question 3

When does adolescence occur?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 3

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.

Important Questions: Reaching the Age of Adolescence - Question 4

What are the two different periods that show rapid growth rate?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 4

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.

Important Questions: Reaching the Age of Adolescence - Question 5

During which of the following stages of growth in height is maximum?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 5

At the beginning of adulthood, the growth is maximum.

Important Questions: Reaching the Age of Adolescence - Question 6

What is the role of sperms in reproduction?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 6

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

Important Questions: Reaching the Age of Adolescence - Question 7

What causes changes in females at the time of puberty?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 7

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.

Important Questions: Reaching the Age of Adolescence - Question 8

Which of the following will occur in females at puberty?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 8

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.

Important Questions: Reaching the Age of Adolescence - Question 9

A girl has menstruation on the 6th day of the month. When is ovulation most likely to occur?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 9

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.

Important Questions: Reaching the Age of Adolescence - Question 10

When do girls overtake boys in height?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 10

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

Important Questions: Reaching the Age of Adolescence - Question 11

In girls, secondary sexual characteristics develop between

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 11

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.

Important Questions: Reaching the Age of Adolescence - Question 12

Why is a diet rich in proteins essential at puberty?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 12

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

Important Questions: Reaching the Age of Adolescence - Question 13

Which of the following is NOT a secondary sexual characteristic feature of girls?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 13

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

Important Questions: Reaching the Age of Adolescence - Question 14

Which of the following is/are true of secondary sexual characteristics of boys?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 14

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

Important Questions: Reaching the Age of Adolescence - Question 15

The menstrual cycle stops in a women at about 50 years old. The woman is said to have reached

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 15

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

Important Questions: Reaching the Age of Adolescence - Question 16

Which of the following does not take place during the final stage of the menstrual cycle?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 16

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.

Important Questions: Reaching the Age of Adolescence - Question 17

Which of these hormones is secreted by endocrine gland located on the top of kidneys?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 17

Adrenaline hormone is secreted by the adrenal cortex of kidney.

Important Questions: Reaching the Age of Adolescence - Question 18

Incomplete development of male secondary sexual characteristics is caused due to deficiency in?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 18

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

Important Questions: Reaching the Age of Adolescence - Question 19

Which of the following hormones initiates metamorphosis in insects?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 19

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

Important Questions: Reaching the Age of Adolescence - Question 20

Which chromosomes determine the sex of an individual?

Detailed Solution for Important Questions: Reaching the Age of Adolescence - Question 20

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

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