Fertilisation and Implantation
Fertilisation and Implantation: MCQs
1. Release of semen into the vagina during coitus is called:
(a) Implantation
(b) Insemination
(c) Fertilisation
(d) Ovulation
2. Fertilisation in humans normally occurs in the:
(a) Uterus
(b) Cervix
(c) Ampullary region of fallopian tube
(d) Ovary
3. Fertilisation is the fusion of:
(a) Two sperms
(b) Ovum and uterus
(c) Male and female gametes
(d) Blastocyst and uterus
4. The layer surrounding ovum that prevents entry of additional sperms is:
(a) Endometrium
(b) Trophoblast
(c) Zona pellucida
(d) Acrosome
5. Acrosome contains:
(a) Hormones
(b) Enzymes
(c) Lipids
(d) RNA only
6. Acrosomal enzymes help sperm to:
(a) Divide rapidly
(b) Produce ATP
(c) Penetrate ovum
(d) Form blastocyst
7. Entry of sperm into secondary oocyte induces completion of:
(a) Mitosis
(b) Meiosis I
(c) Meiosis II
(d) Cytokinesis only
8. Completion of meiosis II produces:
(a) Two ova
(b) Four sperms
(c) Second polar body and ovum
(d) Blastomeres
9. The zygote formed after fertilisation is:
(a) Haploid
(b) Diploid
(c) Triploid
(d) Tetraploid
10. Number of chromosomes in human zygote is:
(a) 23
(b) 44
(c) 46
(d) 92
11. Human female produces ova carrying:
(a) X chromosome only
(b) Y chromosome only
(c) Both X and Y
(d) No sex chromosome
12. Human male produces sperms carrying:
(a) X chromosome only
(b) Y chromosome only
(c) Either X or Y chromosome
(d) No sex chromosome
13. Which combination produces a male baby?
(a) XX
(b) XO
(c) XY
(d) YY
14. Sex of the baby is determined by the:
(a) Mother
(b) Father
(c) Ovary
(d) Uterus
15. Repeated mitotic divisions of zygote are called:
(a) Implantation
(b) Cleavage
(c) Gastrulation
(d) Ovulation
16. Cells formed during cleavage are called:
(a) Spermatids
(b) Blastomeres
(c) Oocytes
(d) Trophoblasts
17. Embryo with 8–16 blastomeres is called:
(a) Gastrula
(b) Morula
(c) Blastocyst
(d) Zygote
18. Outer layer of blastocyst is called:
(a) Endometrium
(b) Inner cell mass
(c) Trophoblast
(d) Morula
19. Inner cell mass of blastocyst develops into:
(a) Placenta
(b) Endometrium
(c) Embryo
(d) Cervix
20. Embedding of blastocyst into endometrium is called:
(a) Ovulation
(b) Cleavage
(c) Implantation
(d) Parturition
Fertilisation and Implantation – Short Answer Questions Only
1. What is insemination?
2. What is fertilisation?
3. Where does fertilisation occur in humans?
4. What is the acrosome?
5. What is the function of acrosomal enzymes?
6. What is the zona pellucida?
7. What is the function of the zona pellucida?
8. What happens when a sperm enters the secondary oocyte?
9. What is formed after completion of meiosis II?
10. What is a zygote?
11. How many chromosomes are present in a human zygote?
12. Why is the zygote diploid?
13. Which chromosome is present in every human ovum?
14. Which chromosomes may be present in human sperms?
15. Who determines the sex of the child?
16. What is cleavage?
17. What are blastomeres?
18. What is a morula?
19. What is a blastocyst?
20. What is the trophoblast?
21. What is the inner cell mass?
22. What is implantation?
23. Where does implantation occur?
24. What is the endometrium?
25. What is polyspermy?
26. How is polyspermy prevented?
27. What is the significance of cleavage?
28. Which part of the blastocyst forms the embryo?
29. Which part of the blastocyst helps in implantation?
30. How many days after fertilisation does implantation usually begin?