
ISC Grade XII Biology - Q1
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1. Sertolicells are regulated by the hormone:-
2. The cell which undergoes meiosis I during spermatogenesis is:-
3. Which of the following is hormone releasing:-
4. The test tube baby programme employs which one of the following technique:-
5. The method of directly injecting a sperm into ovum in assisted reproductive technology is called:-
6. The method of transferring ovum and sperm into fallopian tube
for fertilization is called:-
7. Assertion: Cleavage starts as zygote moves through the isthmus.
Reason: Inner cell mass gets differentiated as the embryo.
8. Classical example of point mutations:-
9. Human embryo at 8 to 16 celled stage is called:-
10. Read the following statements.
i) Each testes has 25 compartments called testicular lobules.
ii) Each testicular lobule contains one to three highly coiled seminiferous tubules in which sperms are produced.
iii) Sertoli cells provide nutrition to the germ cells.
iv) Sertoli cells are activated by FSH .
Which of above statements are incorrect?
11. Administration of which contraceptive device within 72 hours
of coitus have been found to be very effective as emergency
contraceptives as they could be used to avoid possible pregnancy
due to casual unprotected intercourse?
12. In girls, first event of puberty is called
13. The trophoblastic cells secrete
14. Which of the following hormones achieves two peaks
during the menstrual cycle?
15. Zona pellucida is formed in
16. The gestation period in human beings is:
17. The process of reduction of the uterus in lactating mother is
called:
18. Gastrulation occurs about ________ days after fertilization.
19. Mammalian ovum is devoid of yolk hence it is :
20. Sertoli cells are found in the testis. These cells are
21. Blastopore is the opening to the exterior of
22. Yolk plug is formed during
23.The shared terminal duct of the reproductive and urinary system in the human male is
23. If for some reason, the vasa efferentia in the human
the reproductive system gets blocked, the gametes will not be transported from
24. The covering of the testis which contains a network of capillaries is called as
25. Find the odd one out.