NCERT Class VIII Science Solutions: Chapter 10-Reaching the age of Adolescence Part 4

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Question 17:

Read the statements given below and fill up the blanks with the correct words listed in the box.

Deep, ductless, nutrients, thyroxine

  1. The meal that includes all __________ is a balanced diet.

  2. Insufficient production of __________ in the tadpoles leads to their incomplete development.

  3. Endocrine glands are also called __________ glands.

  4. After attaining puberty, boys develop a _________ voice.

Answer:

  1. The meal that includes all nutrients is a balanced diet.

  2. Insufficient production of thyroxine in the tadpoles leads to their incomplete development.

  3. Endocrine glands are also called ductless glands.

  4. After attaining puberty, boys develop a deep voice.

Question 18:

Fill the blank circles in figure and identify the sex of child A and B.

Result for identify the sex of child A and B (Q)

Identify the Sex of Child a and B (Q)

Result for identify the sex of child A and B (Q)

Answer:

Result for identify the sex of child A and B (A)

Identify the Sex of Child a and B (A)

Result for identify the sex of child A and B (A)

LONG ANSWER QUESTIONS

Question 19:

During adolescence, the body of boys and girls undergoes certain changes. Given below are a few of those changes.

  1. Broad shoulders

  2. Wider chests

  3. Wider region below waist

  4. Development of muscles

  5. Development of mammary glands

  6. Growth of facial hair

  7. Acne and pimples on face

  8. Development of sex organs

  9. High-pitched voice

  10. Growth of pubic hair.

Categories these changes into those that occur in boys and those that occur in girls and fill in the table given below

Body Changes During Adolescence (Q)
Body changes during Adolescence (Q)

Body changes during Adolescence

Boys

Girls

Answer:

Body Changes During Adolescence (A)
Body changes during Adolescence (A)

Body changes during Adolescence

Boys

Girls

Broad shoulders

Development of pubic hair

Wider chests

High-pitched voice

Growth of muscles

Development of sex organs

Growth of facial hair

Acne and pimples on face

Acne and pimples on face

Development of mammary glands

Development of sex organs

Wider region below waist

Development of pubic hair