NCERT Class VIII Science Solutions: Chapter 10-Reaching the Age of Adolescence Part 4 (For CBSE, ICSE, IAS, NET, NRA 2022)

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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)

Answer:

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
BoysGirls

Answer:

Body Changes During Adolescence (A)
Body changes during Adolescence
BoysGirls
Broad shouldersDevelopment of pubic hair
Wider chestsHigh-pitched voice
Growth of musclesDevelopment of sex organs
Growth of facial hairAcne and pimples on face
Acne and pimples on faceDevelopment of mammary glands
Development of sex organsWider region below waist
Development of pubic hair