NCERT Class VIII Science Solutions: Chapter 10-Reaching the age of Adolescence Part 2

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VERY SHORT ANSWER QUESTIONS

Question 7:

Unscramble the underlined words in the following sentences.

  1. Reproductive life of a woman lasts from hacreemn to spauoemen.

  2. The development of a caterpillar to an adult butterfly is termed as poommertaissh.

  3. The overgrowth of sumselc in xalnyr leads to the hoarse voice in adolescent boys.

  4. Dannalier helps the body to adjust and fight the stress.

Answer:

  1. Reproductive life of a woman lasts from menarche to menopause.

  2. The development of a caterpillar to an adult butterfly is termed as metamorphosis.

  3. The overgrowth of muscles in larynx leads to the hoarse voice in adolescent boys.

  4. Adrenalin helps the body to adjust and fight the stress.

Question 8:

Complete the following sentences.

  1. In females, the uterine wall thickens to receive the __________.

  2. Endocrine glands release hormones directly into___________ for transportation to the __________.

  3. The sex hormones, _______________________ and estrogen are responsible for the development of __________ characters.

  4. Release of sex hormones is under the control of a hormone secreted from the __________.

Answer:

  1. In females, the uterine wall thickens to receive the fertilised egg.

  2. Endocrine glands release hormones directly into blood stream for transportation to the target site.

  3. The sex hormones, testosterone, estrogen and estrogen are responsible for the development of secondary sexual characters.

  4. Release of sex hormones is under the control of a hormone secreted from the pituitary gland.

Question 9:

Give a suitable word for each of the following statements.

  1. The site which responds to a hormone.

  2. Name of a gland which transports secretions through ducts.

  3. Chemicals which control changes at adolescence stage.

  4. It marks the beginning of reproductive period.

Answer:

  1. Target site

  2. Sweat glands/salivary glands/oil glands (any one)

  3. Hormones

  4. Puberty

Question 10:

Name the hormone that is released by testes at the onset of puberty.

Answer:

Testosterone

Image of effect of Testosterone

Image of Effect of Testosterone

Image of effect of Testosterone

Question 11:

Name the female hormone produced by ovaries that helps in development of mammary glands.

Answer:

Estrogen.

Image of Estrogen

Image of Estrogen

Image of Estrogen