CBSE Class 12 Biology Human Reproduction Question Bank

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BIOLOGY

HUMAN REPRODUCTION 

1. Name the cells which secrete androgens.

2. What does the head of a sperm consists of ?

3. Name the structure which secretes progesterone.

4. Name the structures which secrete estrogen .

5. Name the site of fertilization in human beings .

6. What is the main function of Sertoli cells ?

7. Name the outermost layer of the blastocyst

8. What promotes completion of second meiotic division in oogenesis ?

9. Testes normally remain suspended in scrotum in mammals. Why?

10. How many spermatozoa will be produced from 100 primary spermatocytes and how many ova will be produced from 100 primary oocytes?

11. Name the three layers of embryo that give rise to all tissues and also name the cells which have the potency to give rise to all the tissues and organs.

12. What is oogenesis? Where does it occur?

13. What is ovulation? What happens to Graafian follicle after ovulation?

14. What is colostrum? What is its importance?

15. Draw a labeled diagram of the following and label six parts i) T.S. of a testes ii) T.S. of an ovary iii) Sperm iv) Ovum. v) Embryo development (vi) Female reproductive system

16. Mention any three differences between spermatogenesis and oogenesis.

17. Differentiate between Leydig cells and Sertoli cells with reference to their location in the organ and their function

18. What is parturition? How is it induced? Which hormones are involved in induction of parturition?

19. What is seminiferous tubule? Name the various types of cells present in it and explain its function.

20. Explain different phases of spermatogenesis with schematic representation.

21. Explain different phases of oogenesis with schematic representation

22. Name the glands associated with male reproductive organs and state their functions.

23. Explain the various phases of menstrual cycle with reference to changes in ovary and uterus and hormonal cycle.

24. Explain the process of fertilization.

25. Explain the stages of embryo development from fertilization to implantation.

26. Draw a diagrammatic presentation of various events during a menstrual cycle.

27. What is placenta? What is its role? Justify Placenta as an endocrine tissue.

28. What are the main features of embryonic development at various months of pregnancy?

29 Women are being blamed for giving birth to a female child. Is it correct to say that the sex of the child is determined by the woman and not by the man? Explain 

 HUMAN REPRODUCTION IN

(MARKING SCHEME)

Q.NO Answer Marks Allotted

1 Leydig cells 1

2 Haploid nucleus , acrosome ½ x 2

3 Corpus luteum 1

4 Ovarian follicles 1

5 Ampullary-isthmic junction of fallopian tube 1

6 Provide nutrition to germ cells 1

7 Trophoblast 1

8 Entry of sperm into cytoplasm of the ovum through zona pellucida membrane and plasma

9 Scrotum helps in maintaining low temperature , necessary for spermatogenesisc`

10 400 spermatozoa , 100 eggs 

11 Ectoderm , endoderm , mesoderm , stem cells 

12 Formation of mature female gamete , Ovary 

13 The release of secondary oocyte from ovary , transforms into graafian follicle

14 Milk produced during initial days of lactation , antibodies to give resistance

15 Diagram – six parts

16 At puberty / embryonic development ,four sperms / one egg ,equal division / unequal division

17 Leydig – interstitial space , androgen , Sertoli – seminiferous tubule , nutrition to germ cells

18 Delivery of foetus , foetal ejection reflex , oxytocin 

19 Highly coiled in testicular lobule ,male germ cells sertoli cells , sperm formation provide nutrition

20 Spermatogonia – primary spermatocyte – secondary spermatocyte –spermatid – sperm 

21 Oogonia- primary oocyte , primary secondary tertiary graafian follicles –secondary oocyte – ovum

22 Paired seminal vesicles , a prostate gland paired bulbourethral gland ,lubrication of penis

23 Menstrual phase – flow follicular phase – follicular growth regeneration of endometrium Ovulation , secretary phase – corpus luteum LH ,FSH role

24 Sperm come s in contact with zona pellucida , block entry of additional sperms , acrosome helps in entry , completion second meiotic division ,second polar body , ootid , haploid nucleus of sperm fuses with ovum

25 Zygote – cleavage , blastomeres ,morula ,blastocyst ,trophoblast , inner cell mass ,attached to endometrium , diiferentiate as embryo ,

impalntation

26 Schematic representation of menstrual cycle ovarian events , uterine events ,hormones of pituitary , ovarian hormones

27 Structural and functional unit between foetus and mother , supply of nutrients and oxygen removal of wastes, hCG, hPL ,estrogens, progestogens

28 One month- heart , end of second month –limbs and digits , end of weeks –major organ system – limbs genital organs fifth month movements ,second trimester fine hair eyelids separate eye lashes

29 Genuine reason

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