Class 12 Biology NEB Past Questions

1. 2. 2081 Set W Q.No. 18 Compare and contrast between voluntary and involuntary muscles. Similarities between voluntary and involuntary muscles

2. 2081 Set W Q.No: 12 Which pair of white blood cells contains phagocytic cells?

1. A. Monocytes and eosinophils
2. B. Monocytes and neutrophils
3. C. Eosinophils and basophils
4. D. Monocytes and lymphocytes

3. 2081 Set V.Q.No. 12 Which of the following epithelium forms the inner lining of vagina?

1. A. Columnar
2. B. Cuboidal
3. C. Stratified keratinized squamous
4. D. Stratified non-keratinized squamous ANIMAL TISSUES 211 are connected to each other and the Compound Epithelium [1 MARK]

4. 1. 2081 Set V Q.No. 18 Compare and contrast simple and compound epithelium. Similarities between simple and compound epithelium Following

5. 2081 Set W Q.No. 17 What is the role of. surrogate mother in the context of IVF?

1. A. Not provided in source
2. B. To ensure successful fertilization To provide emotional support to biological mother To carry the pregnancy to full term
3. C. Not provided in source
4. D. To donate ova

6. 1. 2081 Set V Q.No. 19 OR Explain the basic steps Involved In IVF. Mention any two potential risks or

7. 2. 2081 Set W Q.No. 19 OR What are pullets? How would you express the scope of poultry in Nepal?

8. 8. 2081 Set V Q.No. 22 Name the causative agent of AIDS. Mention its mode of transmission, symptoms and preventive

9. 1. 2081 Set W Q.No. 9 Describe the process of micro propagation to rapidly produce large number of identical plantlets

10. 1. 2081 Set V Q.No. 9 How do organic fertilizers contribute to sustainable agricultural practices compared to chemical fertilizers, and

11. 2. 2081 Set W Q.No. 19) What is coelom? How is it formed in frog's development? A coelom is a

12. 2081 Set V Q.No. 13 Which is the correct sequence in embryonic development of frog? a.

1. A. Not provided in source
2. B. Morula, blastula, gastrula Blastula, morula, gastrula C
3. C. Not provided in source
4. D. Morula, gastrula, blastula Blastula, gastrula, morula DEVELOPMENTAL BIOLOGY 225 [1 MARK]

13. 2081 Set W Q.No. 13 What happens during spermiogenesis in the process of spermatogenesis?

1. A. Primary spermatocytes are formed from b. spermatogonia Secondary spermatocytes are formed from primary spermatocytes Spermatids are formed from secondary spermatocytes
2. B. Not provided in source
3. C. Not provided in source
4. D. Spermatozoa are formed from spermatids-

14. 2081 Set W Q.No. 13 What happens during spermiogenesis in the process of spermatogenesis?

1. A. Primary spermatocytes are formed from b. spermatogonia Secondary spermatocytes are formed from primary spermatocytes Spermatids are formed from secondary spermatocytes
2. B. Not provided in source
3. C. Not provided in source
4. D. Spermatozoa are formed from spermatids-

15. 1. 2081 Set V Q.No. 19 What is blastula? How is blastula formed during development of frog? Why micromeres divide

16. 2081 Set V Q.No. 1 Which of the following type of artificial vegetative propagation in which root is induced while it is still attached to the parent plant and it is particularly suitable for plants having soft branches lying near to soil? r b.

1. A. Air layering : Grafting
2. B. Not provided in source
3. C. Soil layering
4. D. Cutting

17. 2081 Set W Q.No. 1 What is called. the. development of fruit without fertilization?

1. A. Parthenocarpy
2. B. Apomixes
3. C. Polyspory
4. D. Parthenogenesis

18. 1. 2081 Set V Q.No. 7 Look at the figure related to the sexual reproduction of angiosperms and answer the

19. 2. 2081 Set W Q.No. 7 Observe the diagram of a pollen grain and answer the questions given below. i.

20. 9. 2081 Set W. Q.No. 11 OR How can chromosomal mutations alter the number and structure of chromosomes? Provide a

21. 2081 Set V Q.No. 3 Which of the following genotypes represents monosomy, a type of. aneuploidy?

1. A. 2п - 2
2. B. 2n - 1
3. C. 2n + 1
4. D. 2n + 1 + 1. Aegilops speltoides (2n = 14) corsalant anno 108 .. Aegilops squarrosa 5:0100 (2n = 14) noitsolansit:2 98 70 00701? [2+2+4]

22. 16. 2081 Set W Q.No. 11) In what way does DNA serve as genetic material of living organisms, and discuss

23. 10. 2081 Set V Q.No. 11 "Genes are inherited in new combination due to crossing over in the gametes". Interpret

24. 15. 2081 Set V Q.No. 11 OR Briefly discuss the Watson and Crick's model of DNA with the help of

25. 1. 2081 Set V Q.No. E In which cross, the genotypic and phenotypic ratio are same? Explain it with reference

26. 2. 2081 Set W Q.No. 8 Explain the mechanism of incomplete dominance up to F2 generation with suitable example. How

27. 2081 Set W Q.No. 3 A heterozygous individual with the genotype Aa Bb is crossed with another heterozygous individual with the genotype Aa Bb. What is the probability of their offspring inheriting the recessive alleles for both traits?

1. A. 1 4
2. B. 100
3. C. 16
4. D. 32

28. 1. 2081 Set W Q.No. 20 Study the given figure and answer the following questions I. Label the parts A

29. 7. 2081 Set W Q.No. 23 Reproduction is essential for the perpetuation of species in nature. In human, sexes are

30. 9. 2081 Set V Q.No. 23 Human alimentary canal. is a complete tube designed for ingestion, digestion, absorption, and assimilation

31. 10. labelled 2081 Set V Q.No. 23 OR Human ear is concerned with hearing and equilibrium. With the help of

32. 2081 Set V Q.No. 16 If a person has puffy 5. appearahce, moon face, low body temperature and is intolerance to cold, what do you think he is suffering from?

1. A. Grave's disease
2. B. Conn's disease c. : Myxoedema d. : Hashimoto's disease
3. C. Not provided in source
4. D. Not provided in source

33. 2081 Set V Q.No. 14 What would happen, if the oxyntic cells of gastric glands become non- functional due to some reasons?

1. A. Lipase enzyme becomes more active
2. B. Protein digestion does not take place c pHof stomach falls
3. C. Not provided in source
4. D. Pepsin is not secreted

34. 2081 Set W Q.No. 15 Which enzymes are eaten likely to act orderly on soyabean sprouts by man as it moves down the alimentary canal?

1. A. Pepsin, trypsin, peptidase
2. B. Trypsin, peptidase, pepsin C
3. C. Not provided in source
4. D. Pepsin, peptidase, trypsin

35. 1. 2081 Set V Q.No. 20) Study the given figure and answer the following questions. i. Label the parts C

36. 11. 2081 Set W Q.No. 23 OR Eyes facilitate binocular vision. Draw V.S. of human eye and explain the structure.

37. 2081 Set W Q.No. 14 Show the correct path of heart. origin and conduction of heart beat in human

1. A. AV-node, SA-node, bundle of His, Purkinje fibers
2. B. SA-node, AV-node, bundle of His, Purkinje fibers
3. C. SA-node, AV-node, Purkinje fibers, bundle of His
4. D. AV-node, bundle of His, Purkinje fibers, SA-node

38. 2081 Set V Q.No. 15 Show the correct pathway for the flow of urine.

1. A. Renal pelvis, ureter, urinary bladder, urethra
2. B. Renal pelvis, ureter, urethra, urinary bladder
3. C. Renal pelvis, urinary bladder, urethra, ureter
4. D. Renal pelvis, urethra, ureter, urinary bladder

39. 2. 2081 Set W Q.No. 21 Taking drugs for non-medical purpose causes its addiction. In your view, what motivates youngsters

40. 1. 2081 Set V Q.No. 21 "Tobacco smoking is injurious to health." Identify some of the health hazards of smoking