Reproduction & Development in Animals MCQs Part IV

1) What is true about the process of fertilization?
a) Only acrosome of sperm enters the egg
b) Two haploid nuclei fuse but the fusion nucleus divides immediately to form two haploid nuclei
c) Entry of sperm activates the egg to complete meiosis
d) Only one sperm enters an egg.

2) In the simple type of placenta, six barriers separate maternal blood from foetal blood. How many barriers are lost in the human placenta?
a) One
b) Two
c) Three
d) Four

3) The relative sizes of egg cell, morula, blastula and gastrula cells are
a) Egg cell is the smallest and gastrula cell is the largest
b) All are of equal size
c) Egg cell is the largest and morula cell is the smallest
d) Egg cell is the largest and gastrula cell is the smallest

4) In mammals, the testes occur in scrotal sacs outside the viscera because of the
a) Presence of urinary bladder
b) Presence of rectum
c) Long vas deferens
d) Requirement of low temperature for spermatogenesis

5) Loss of reproductive capacity in women after age of 45 years is called
a) Mensturation
b) Ageing
c) Menopause
d) Menarche

6) The chemical substance present on the surface of a sperm is
a) Hyalouronidase
b) Antifertilizin
c) Agglutinin
d) Fertilizin

7) Which of the following develops from ectoderm?
a) Adrenal medulla
b) Adrenal cortex
c) Blood
d) Lymph

8) Monozygotic twins are produced when
a) Two ova are fertilized simultaneously
b) Incomplete cleavage of zygote
c) First cleavage of zygote is followed by separation into two
d) There is no cleavage

9) During cleavge, nucleocytoplasmic ratio (nucleus/cytoplasm)
a) Increases
b) Decreases
c) Remains same
d) None of the above

10) Acrosomal reaction occurs at the time of
a) Excretion
b) Painful stimulation
c) Movement of sperm
d) Fertilisation

11) The presence of massive yolk at one end makes the egg
a) Telolecithal
b) Mesolecithal
c) Centrolecithal
d) Oligolecithal

12) The correct sequence in development is
a) Fertilization ® Zygote ® Cleavage ® Morula ® Blastula ® Gastrula
b) Fertilization ® Zygote ® Blastula ® Morula ® Cleavage ® Gastrula
c) Fertilization ® Cleavage ® Morula ® Zygote ® Blastula ® Gastrula
d) Cleavage ® Zygote ® Fertilization ® Morula ® Blastula ® Gastrula

13) The somatic chromosome number is 40. What will be the chromosome number in the cells of the seminiferous tubule?
a) 40
b) 20
c) 10
d) 40 and 20

14) The number of eggs released in the life time of a woman is approximately
a) 40
b) 400
c) 4000
d) 20000

15) The division of the human egg is
a) Equal holoblastic
b) Unequal holoblastic
c) Superficial meroblastic
d) Discoidal meroblastic

16) The egg of a cockroach is
a) Alecithal
b) Oligolecithal
c) Centrolecithal
d) Microlecithal

17) Which is absent in the human sperm?
a) Nucleus
b) Mitochondria
c) Centriole
d) Endoplasmic reticulum

18) When the egg is not fertilised, the yellow coloured corpus luteum degenerates to form the
a) Corpus albicans
b) Corpus callosum
c) corpus igemina
d) Corpor quadrigemina

19) Sertoli cells are found
a) Between the seminiferous tubules
b) In the germinal epithelium of ovary
c) In the uppermost part of fallopian tube
d) In the germinal epithelium of seminiferous tubules

20) Blood flowing through the umbilical cord of the mammalian embryo is
a) 100% foetal
b) 100% maternal
c) 75% maternal, 25% foetal
d) 50% maternal and 50% foetal

21) In the uterus, endometrium proliferates in response to
a) Relaxin
b) Oxytocin
c) Progesterone
d) Oestrogen

22) Neubnkern is part of the
a) Human ovum
b) Human sperm
c) Foetus
d) Graafian follicle

23) Oral contraceptives are used by females to check
a) Implantation
b) Fertilization
c) Ovulation
d) Entry of sperms in vagina

24) The stage just before the entry of the sperms into the ovum is called
a) Capacitation
b) Maturation
c) Fertilization
d) Insemination

25) Ectoderm forms
a) Bones and muscles
b) Lining of the gut and respiratory organs
c) Enamel of the teeth and the cornea of the eye
d) Gonads and blood vessels

26) The Greek word “sexus” means
a) Disjunction
b) Disintegration
c) Union
d) Both A and B

27) An accessory genital gland found only in males is
a) Cowper’s gland
b) Bartholin gland
c) Perineal gland
d) Prostate gland

Answers

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