Biology MCQ Quiz Hub

1. The Leydig cells as found in the human body are the secretory source of
Glucagon
Androgens
Progesterone
Intestinal mucus

2. Signals for parturition originate from
Placenta only
Fully developed foetus only
Both placenta as well as fully developed foetus
Oxytocin released from maternal pituitary

3. Which one of the following statements is false in respect of viability of mammalian sperm?
Sperm is viable for only up to 24 hours
Viability of sperm is determined by its motility
Sperms must be concentrated in a thick suspension
None of the above

4. Which one of the following statements is correct?
FSH and LH occur in both males and females
The ovarian cycle depends on the blood levels of FSH and LH.
FSH and LH stimulate the follicle to secrete estrogen.
All of the above

5. Foramen ovale
Is a shallow depression in the interventricular septum
Is a condition in which the heart valves do not completely close
Is a connection between the pulmonary trunk and the aorta in the fetus
Connects the two atria in the fetal heart

6. The part of Fallopian tube closest to the ovary is
Infundibulum
Isthmus
Cervix
Ampulla

7. About which day in a normal human menstrual cycle does rapid secretion of LH (Popularly called LH-surge) normally occurs?
5th day
11th day
14th day
20th day

8. Ovulation in the human female normally takes place during the menstrual cycle
At the end of the proliferative phase
Just before the end of the secretory cycle
At the mid secretory phase
At the beginning of the proliferative phase

9. Which of the following structures are derivatives of the endoderm?
Skin and nerve cord
Alimentary canal and respiratory structures
Muscles and blood
Excretory and reproductive structures

10. In the fully organized polygonum type of embryo sac, what is the ratio of haploid, diploid and triploid nuclei?
6:01:00
6:00:01
3:01:03
3:02:03

11. Human seminal plasma, the fluid part of semen, is produced by contributions from the: i. Urethra ii. Prostate iii. Seminal vesicle iv. Bulbourethral gland
i and iii
i and iv
i, iii and iv
ii, iii and iv

12. Which one of the following statement is correct?
Spermatogenesis is the formation of sperm cells.
Spermatogenesis occurs in the seminiferous tubules.
Follicle-stimulating hormone (FSh) indirectly stimulates spermatogenesis.
All of these are correct

13. Which one of the following statements is incorrect about menopause?
Generally occurs between the ages of 45 and 55
Causes the cessation of the female reproductive cycle
Anterior pituitary no longer produces FSH and LH
Ovaries slowly reduce their secretion of estrogen

14. Which one of the following statement is correct about sertoli cells also called as nurse cells?
Found in adrenal cortex and secrete adrenaline
Found in ovaries and secrete progesterone
Found in pancreas and secrete cholecystokinin
Found in Seminiferous tubules and provide nutrition of germ cells

15. Which one of the following statements about morula in humans is correct?
It has more cytoplasm and more DNA than an uncleaved zygote
It has almost equal quantity of cytoplasm as an uncleaved zygote but much m
It has far less cytoplasm as well as less DNA than in an uncleaved zygote
It has more or less equal quantity of cytoplasm and DNA as in uncleaved zyg

16. Foetal ejection reflex in human female is induced by
Differentiation of mammary glands
Pressure exerted by amniotic fluid
Release of oxytocin from pituitary
Fully developed foetus and placenta

17. Which one of the following is the most likely root cause why menstruation is not taking place in regularly cycling human female?
Retention of well-developed corpus luteum
Fertilisation of the ovum
Maintenance of the hypertrophical endometrial lining
Maintenance of high concentration of sex-hormones in the blood stream

18. The correct sequence of spermatogenetic stages leading to the formation of sperms in a mature human testis is
Spermatogonia-spermatid-spermatocyte-sperms
Spermatocyte-spermatogonia-spermatid-sperms
Spermatogonia-spermatocyte-spermatid-sperms
Spermatid-spermatocyte-spermatogonia-sperms

19. Correct sequence of embryo development:
Gamete → Zygote → Morula → Blastula → Gastrula
Gamete → Zygote → Blastula → Morula → Gastrula
Gamete → Neurula → Gastrula
Gamete → Neurula → Morula

20. Which one of the following statements is incorrect about menstruation?
The beginning of the cycle of menstruation is called menarche
During normal menstruation about 40 ml blood is lost
The menstrual fluid can easily clot
At menopause in the female, there is especially abrupt increase in gonadotr

21. The hemoglobin of a human foetus:
Has a higher affinity for oxygen than that of an adult
Has a lower affinity for oxygen than that of the adult
Its affinity for oxygen is the same as that of an adult
Has only two protein subunits instead of four

22. What happens during fertilisation in humans after many sperms reach close to the ovum?
Cells of corona radiata trap all the sperms except one
Only two sperms nearest the ovum penetrate zona pellucida
Secretions of acrosome helps one sperm enter cytoplasm of ovum through zona
All sperms except the one nearest to the ovum lose their tails

23. ZIFT is
Transfer of mixture of sperms and ova into the fallopian tube
Transfer of embryo into the uterus
Transfer of zygote into the fallopian tube
Transfer of mixture of sperms and ova into the uterus

24. At the time of implantation, the human embryo is called
zygote
blastocyst
embryo
foetus

25. Sertoli cells are nourishing cells in the testis. They also secrete a hormone. Identify the same.
Inhibin
Gonadotropin
Testosterone
Relaxin

26. The type of connective tissue that is associated with the Umbilical cord is:
Adipose connective tissue
Jelly-like connective tissue
Areolar connective tissue
Reticular connective tissue

27. The chemical substance released by activated spermatozoa that acts on the ground substances of the follicle cells is known as
Progesterone
Hyaluronidase
Relaxin
Gonadotropin

28. Usually the first movements of the foetus and appearance of hair on its head are usually observed during which month of pregnancy?
Third month
Fourth month
Fifth month
Sixth month

29. Which of the following are secretions produced by the spermatozoa at the time of fertilization?
Fertilizin and sperm lysin
Anti-fertilizin and sperm lysin
Fertilizin and anti-fertilizin
only sperm lysin

30. Which of the following groups of cells in the male gonad, represent haploid cells?
Primary spermatocytes
Spermatogonial cells
Germinal epithelial cells
Secondary spermatocytes

31. In the human female, menstruation can be deferred by the administration of:
Combination of estrogen and progesterone
Combination of FSH and LH
LH only
FSH only

32. Both corpus luteum and macula lutea are
found in human ovaries
a source of hormones
characterized by a yellow colour
contributory in maintaining pregnancy

33. Which one of the following statement is incorrect?
Scrotum regulates the temperature of the developing sperm within the testes
Middle piece of a sperm contains many mitochondria to provide energy for mo
Epididymis and ductus deferens also store sperm.
Sperm contributes cytoplasm and organelles to zygote.

34. In spermatogenesis, reduction division of chromosome occurs during conversion of
Secondary spermatocytes to spermatids
Primary spermatocytes to secondary spermatocytes
Spermatogonia to primary spermatocytes
Spermatids to sperms

35. Which one of the followings causes the mammary glands to enlarge at puberty?
Testosterone
Progesterone
Estrogen
Oxytocin

36. What is the inner lining of the uterus called?
Cervix
Oviduct
Endometrium
Fimbriae

37. Where does fertilization usually take place?
Cervix
Vagina
Uterus
Oviduct

38. The process of sperm production takes place in the ______.
Epididymis
Vas deferens
Prostate glands
Seminiferous tubules

39. Which one of the followings secretes the gonadotropic hormones?
Adrenal
Anterior pituitary
Posterior pituitary
Thyroid

40. The secretory phase in the human menstrual cycle is also called
Luteal phase and lasts for about 6 days
Follicular phase lasting for about 6 days
Luteal phase and lasts for about 13 days
Follicular phase and lasts for about 13 days

41. Vasa efferentia are the ductules leading from
Epididymis to urethra
Testicular lobules to rete testis
Rete testis to vas deferens
Vas deferens to epididymis

42. Which one of the followings is incorrectly matched regarding female reproductive organs?
Ovaries - eggs and sex hormones are produced
Oviducts - serves as the site of fertilization
Uterus - Serves as the birth canal
Cervix - Contains opening to embryo/fetus

43. Which one of the followings is incorrectly matched regarding male reproductive organs?
Testes: Sperm and sex hormones are produced
Epididymis: Ducts where sperm mature
Prostate gland: Contributes fluid to semen
Urethra: Contributes nutrients and mucus-containing fluid to semen

44. Which one of the following events occurs in luteal phase (or secretory phase) of the menstrual cycle?
Follicle-stimulating hormone (FSH) secretion begins
Follicle maturation takes place
Corpus luteum forms
Endometrium breaks down

45. Where do the female gonads (paired ovaries) lie?
Pelvic cavity
Thoracic cavity
Abdominal cavity
Scrotal sacs

46. Which one of the following statements about human sperm is correct?
Acrosome serves no particular function
The sperm lysins in the acrosome dissolve the egg envelope facilitating fer
Acrosome serves as a sensory structure leading the sperm towards the ovum
All of the above

47. The testes in humans are situated outside the abdominal cavity inside a pouch called scrotum. The purpose served is for
Providing a secondary sexual feature for exhibiting the male sex
Maintaining the scrotal temperature lower than the internal body temperatur
Escaping any possible compression by the visceral organs
Providing more space for the growth of epididymis

48. 32-celled stage of human embryo is
Smaller than fertilized egg
Same size as fertilized egg
Two times the size of fertilized egg
Four times the size of fertilized egg

49. A cross section at the midpoint of middle piece of human sperm will show
Centriole, mitochondria and 9 + 2 arrangement of microtubules
Centriole and mitochondria
Mitochondria and 9 + 2 arrangement of microtubules
9 + 2 arrangement of microtubules only

50. A mature sperm has
A pair of flagella
A nucleus, an acrosome and a centriole
A nucleus, an acrosome, a pair of centrioles
A nucleus, an acrosome, a pair of centrioles and a tail