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Reaching the Age of Adolescence Test - 9

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Reaching the Age of Adolescence Test - 9
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  • Question 1
    1 / -0
    Number of chromosomes present in a human cell is:
    Solution
    • There are 23 pairs of chromosomes present in a human cell except for gametes, which makes it a total of 46 chromosomes. 
    • Out of these, 22 pairs are autosomes and the remaining one is the pair of sex chromosomes.

    So, the correct answer is option A.
  • Question 2
    1 / -0
    The most conspicuous visible change that occurs in adolescent boys due to puberty is:
  • Question 3
    1 / -0
    Which of the following hormones controls metamorphosis in a frog?
    Solution
    Metamorphosis includes the developmental changes during the life span of an organism. The thyroxine hormone released from the thyroid gland brings the developmental changes during the metamorphosis. Thyroxine regulates the metabolism of an organism.
    So, the correct answer is option D.
  • Question 4
    1 / -0
    Unscramble the underlined words in the following sentences
    The reproductive life of a woman lasts from hacreemn to spauoemen.
    Solution
    • Menarche is the first occurrence of menstruation and marks the beginning of the reproductive period.
    • Menopause is the end of menstruation and marks the end of the reproductive period in women.
    Therefore, the correct answer is option A.
  • Question 5
    1 / -0
    Which of the following results in a male child?
    Solution
    A male produces both X and Y bearing sperms. If the sperm which contains X chromosome fuses with female ovum, it produces a girl child. If the fusion occurs between Y containing sperm and ovum, the baby will be a boy. Thus the correct answer is option B. 
  • Question 6
    1 / -0
    Which of the following endocrine glands is unpaired?
    Solution
    The pituitary gland is an endocrine gland. It is present near the base of the brain. It is a gland that is not paired. Whereas, adrenal, testes, ovary are the glands that are paired.
    So, the correct answer is 'Pituitary'.

  • Question 7
    1 / -0
    Which among the following is an example of secondary sexual character? 
    Solution
    Those structures which are directly concerned with reproduction are considered primary sex characteristics. 
    Secondary sexual characters can be used to differentiate between males and females and usually serve the purpose of attracting potential mates. 
    Testosterone is responsible for male secondary sex characteristics such as a deep voice and facial hair. 
    Estrogens contribute to the development of the female secondary sex characteristics and stimulate the development of the mammary glands /breast.
    Therefore, the correct answer is option A.
  • Question 8
    1 / -0
    The cyclic period of sexual activity in non-human female mammals is called
  • Question 9
    1 / -0
    Estrogen is secreted by 
    Solution
    Estrogen is the female sex hormone that is secreted by developing follicles in the ovary. Secretion of gonadotropins during the follicular phase of the ovarian cycle stimulates the growth and development of follicles. These developing follicles secrete estrogen. 
    Thus, the correct answer is option C.
  • Question 10
    1 / -0
    The changes in the body of adolescents during puberty are mainly because of the secretion of:
    Solution
    At the onset of puberty, the testes start releasing the male hormone testosterone. It promotes secondary sexual characteristics in males during puberty like masculine voice, hair growth on the face, chest, etc. Estrogen is a female hormone responsible for the development of secondary sexual characteristics like the menstrual cycle, breast development, etc. It is released by the ovaries.
    So, the correct answer is option C.
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