Reaching the age of adolescence Worksheet-6

Reaching the age of adolescence Worksheet-6


Comprehension Based Questions:


          Inside the fertilized egg or zygote is the instruction for determining the sex of the baby. This instruction is present in the thread-like structures, called chromosomes. All human beings have 23 pairs of chromosomes in the nuclei of their cells. Two chromosomes out of these are the sex chromosomes, named X and Y. A female has two X chromosomes, while a male has one X and one Y chromosome. The belief that the mother is responsible for the sex of her baby is completely wrong and to blame her for this is totally unjustified.

          The caterpillar has to pass through various stages to become an adult moth.

         The tadpole passes through certain stages to become a frog. Metamorphosis in insects is controlled by insect hormones. In a frog, it is controlled by thyroxine, the hormone produced by thyroid gland. Thyroxine production requires the presence of iodine in water.


  1. Which of this structure determine the sex of an individual?

(A) Testes          (B) Ovaries        (C) Ovum          (D) Zygote


  1. Information of sex determination lies in-

(A) Nucleus                                   (B) Chromosomes

(C) Gene                                         (D) Male gamete (E) All


  1. What is true for sperms?

(A) 22 and Two X chromosomes                

(B) 22 and Two Y chromosomes

(C) 22 and One X and one Y chromosome         

(D) 22 and either Y or X chromosome

(E) None of these


  1. Which of these responsible for determining sex of the child?

(A) Male gamete                          (B) Father                  

(C) Female gamete                      (D) Mother

(E) Both male gamete and father


  1. Which of these glands is responsible for normal growth?

(A) Thyroid                                    (B) Adrenaline

(C) Pancreas                                  (D) Pituitary


  1. Hormone of which gland maintains the correct salt balance in the blood?

(A) Thyroid       (B) Adrenal       (C) Pancreas     (D) Pituitary


  1. When a person is very angry, embarrassed or worried, there is rush of which hormone in his body?

(A) Growth hormone                  (B) Thyroxine

(C) Adrenaline                             (D) Insulin


Answer key:

  1. (D)

  2. (E)

  3. (D)

  4. (E)

  5. (C)

  6. (B)

  7. (C)