NCERT Class VIII Science Solutions: Chapter 10-Reaching the Age of Adolescence Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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Question 1:

The belief that the mother is completely responsible for the sex of the child is wrong because the child

  1. Gets sex chromosome only from the mother.
  2. Develops in the body of the mother.
  3. Gets one sex chromosome from the mother and the other from the father.
  4. Gets sex chromosome only from the father.

Answer: C

Question 2:

AIDS can spread from an infected person to another person through

  1. Sharing food
  2. Blood transfusion
  3. Sharing comb
  4. A mosquito bite

Answer: B

Question 3:

Given below are events that lead to pregnancy and development of embryo.

  1. Fertilization of egg
  2. Maturation of egg
  3. Release of egg
  4. Embedding of embryo in thickened uterine wall.

Which of the following options gives the correct order of sequence in which they occur?

  1. i, ii, iii, iv,
  2. ii, i, iii, iv
  3. i, iv, ii, iii
  4. ii, iii, i, iv.
Sequence of Pregnancy and Development

Answer: D

Question 4:

For the metamorphosis of tadpoles which of the following elements must be available in water?

  1. Chlorine
  2. Carbon
  3. Sulphur
  4. Iodine

Answer: D

Question 5:

The most conspicuous visible change that occurs in boys during puberty is:

  1. Development in voice box.
  2. Increase in
  3. Production of sperms.
  4. Increased sweating.

Answer: B

Question 6:

Structures present in a cell which is responsible for determination of the sex of a baby is

  1. Cytoplasm
  2. Cell membrane
  3. Nucleus
  4. Chromosome

Answer: D