Biology Today — January 2018

(Jacob Rumans) #1

  1. Read the following statements and select the correct option.
    I. ADAM (Androgen Deficiency in Ageing Males) is also
    called male menopause, normally occurs in men above
    the age of 50.
    II. Testosterone is principal androgen which brings about
    the growth of the secondary sex organs and secondary
    sexual characters.
    III. Semen has a pH of 7.35 to 7.50 so it is slightly alkaline.
    I V. In male LH is called interstitial cells stimulating hormone
    (ICSH), as it stimulates sertoli cells of the testes to
    secrete androgens.
    (a) I only (b) II and III
    (c) III and IV (d) I and IV

  2. The acrosome of human sperm is derived from
    (a) Golgi body (b) distal centriole
    (c) ring centriole (d) mitochondria.

  3. Select the correct option with a group of structures representing
    testis only.
    (a) Seminiferous tubules, interstitial cells, prostate gland
    (b) Sertoli cells, Leydig’s cells, vas efferentia
    (c) Interstitial cells, seminiferous tubules, vas deferens
    (d) Prostate gland, Leydig’s cells, sertoli cell

  4. Study the given figure showing T.S. of mammalian testis and
    identify the parts labelled as P, Q, R and S.


P

Q
R
S

P Q R S
(a) Leydig’s cells Sertoli cells Germinal
epithelium

Secondary
spermatocyte
(b) Sertoli cells Leydig’s
cells

Spermatogonium Spermatids

(c) Leydig’s cells Sertoli cells Primary
spermatocyte

Spermatids

(d) Sustentacular
cells

Leydig’s
cells

Spermatogonium Primary
spermatocyte

Exam Section



  1. The spermiogenesis involves all of the following except
    (a) formation of mitochondrial sheath
    (b) formation of proximal and distal centrioles
    (c) formation of acrosome
    (d) shortening of sperm. (MH CET 2017)

  2. The prostatic fluid forms about ___ of total volume of
    semen.
    (a) 60% (b) 50%
    (c) 40% (d) 30% (MH CET 2017)
    3. Identify the correct statement on ‘inhibin’.
    (a) Is produced by granulosa cells in ovary and inhibits the
    secretion of LH
    (b) Is produced by nurse cells in testes and inhibits the
    secretion of LH
    (c) Inhibits the secretion of LH, FSH and prolactin
    (d) Is produced by granulosa cells in ovary and inhibits the
    secretion of FSH (NEET Phase-I 2016)
    4. Which of the following depicts the correct pathway of
    transport of sperms?
    (a) Rete testis → Efferent ductules → Epididymis → Vas
    deferens
    (b) Rete testis → Epididymis → Efferent ductules → Vas
    deferens
    (c) Rete testis → Vas deferens → Efferent ductules
    → Epididymis
    (d) Efferent ductules → Rete testis → Vas deferens
    → Epididymis (NEET Phase-II 2016)
    5. Which one of these is not an accessory glands in male
    reproductive system?
    (a) Cowper’s gland (b) Prostate gland
    (c) Bartholin’s gland (d) Seminal vesicle
    (Karnataka CET 2016)
    6. The Leydig’s cells found in the human body are the secretory
    source of
    (a) glucagon (b) androgens
    (c) progesterone (d) intestinal mucus.
    (J & K CET 2015)
    7. How many days does it take for spermatogenesis to take place?
    (a) 40 to 65 days (b) 60 to 75 days
    (c) 70 to 95 days (d) 50 to 65 days
    (UP CPMT 2015)
    8. Vasa efferentia are muscular tubes, each of which connects
    (a) an epididymis to vas deferens
    (b) vas deferens to seminal vesicle
    (c) rete testis to vas deferens
    (d) rete testis to epididymis. (JIPMER 2014)
    9. The release of sperms from the seminiferous tubules is called
    (a) spermiogenesis (b) spermiation
    (c) spermatogenesis (d) fertilisation
    (e) gametogenesis. (Kerala PMT 2014)
    10. Starting from the maximum, arrange the following male
    reproductive accessory organs in the correct order, based
    on the amount of secretion.
    (i) Prostate gland
    (ii) Seminal vesicle
    (iii) Bulbourethral gland
    (a) (i) > (ii) > (iii) (b) (iii) > (ii) > (i)
    (c) (ii) > (iii) > (i) (d) (ii) > (i) > (iii)
    (AIIMS 2013)

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