Question 1

What is the period of life, when the body undergoes changes, leading to reproductive maturity, called?

Accepted Answer

Adolescence is the period of life when the body undergoes changes, leading to reproductive maturity. During this time, the body undergoes several physical and mental changes, typically starting around the age of 11 and lasting up to 18 or 19 years of age. These adolescents are also called teenagers.

Question 2

The onset of puberty brings about growth in height. Which bone parts primarily elongate to cause this?

Accepted Answer

The onset of puberty brings about a sudden increase in height. This is due to the lengthening of the long bones of the arms and the legs that make a person tall during the adolescent years.

Question 3

In girls, the voice box often begins to look enlarged. What is the voice box also known as?

Accepted Answer

The voice box is also known as the larynx. During puberty, the larynx begins to grow in both boys and girls, but in boys, it grows larger and is visible as an adam's apple, while in girls, it remains small.

Question 4

What is the protruding part of the throat in adolescent boys called?

Accepted Answer

In boys, under the influence of hormones, the voice box grows larger and can be seen as a protruding part of the throat called the Adam's apple.

Question 5

Which endocrine glands secrete hormones that control the changes during puberty?

Accepted Answer

Endocrine glands release hormones directly into the bloodstream to reach a particular body part called target site. Hormones secreted by endocrine glands control the changes that take place during puberty.

Reaching the Age of Adolescence — MP Board Class 8 Science Important Questions & Revision Notes