Biology | Question Paper Class 12 of 2081-2024 | Download in PDF

Attempt all the questions.

Group 'A' (Botany and Zoology)

Multiple Choice Questions No. 1 to 6 (Group A Botany) and Question No 12 to 17 (Group A Zoology) will be provided after 30 minutes of starting examination. Rewrite its (MCQ) correct options (answer) in your same answer sheet.

Check here for MCQs:

NEB Class 12 Biology Botany-Zoology Exam Paper 2081-2024 | Code: 2021W | PDF Download.

Section: I (Botany)

Group 'B'

Short answers questions. [4x4=16]

6. Define parenchyma tissue and explain its structure and function. [1+2+1]

7. Observe the diagram of a pollen grain and answer the questions given below.

i. When is the pollen grain produced in a flower ? [1]
ii. Identify the parts A and C . [1]
iii. In angiosperms, the pollen grain germinates to produce pollen tube that caries two male gametes. What is the purpose of carrying two male gametes when single gamete can fertilize the egg ? [2]

8. Explain the mechanism of incomplete dominance up to F2 generation with suitable example. How does it differ from complete dominance ? [2+2]
OR
Describe any four practical importance of seed dormancy in agriculture and horticulture. [2+2]

9. Describe the process of micro propagation to rapidly produce large number of identical plantlets and describe how it can be used in conservation efforts for endangered plant species. [2+2]

Group 'C'

Long answers questions.   [2x8=16]

10. The light-independent reactions of photosynthesis involve the conversion of carbon dioxide into glucose. Explain the steps involved in this process and how the products of the light dependent reactions (ATP and NADPH) are utilized. [5+3 ]

11. In what ways does DNA serve as genetic material of living organisms, and discuss its double helical structure with labelled diagram. Analyze the similarities and differences between DNA and RNA, and evaluate the significance of these molecules in genetic processes. [1+4+2+1]
OR
How can chromosomal mutations alter the number and structure of chromosomes ? Provide a detailed discussion on the various types of chromosomal mutations. Analyze the significance of chromosomal mutation in an organism. [1+4+3]

Section: II (Zoology)

Group 'B'

Short answers questions. [4x4=16]

18. Compare and contrast between voluntary and involuntary muscles. [2+2]

19. What is coelom ? How is it formed in frog's development ? [1+3]
OR
What are pullets ? How would you express the scope of poultry in Nepal ? [1+3]

20. Study the given figure and answer the following questions .

i. Level the part A and B [1]
ii. Name two hormones released from part B. [1]
iii. Which hormone is called birth hormone and why ? [2]

21. Taking drugs for a non medical purpose causes its addiction. In your view, what motivates youngsters to take drugs and how can this be prevented ? [4]

Group 'C'

Long answer questions.     [2x8=16]

22. Name the causative agent of typhoid. Explain its mode of transmission, symptoms and preventive measures. Mention the body organ that gets affected in severe cases. [1+2+2+2+1]

23. Reproduction is essential for the perpetuation of species in nature. In human, sexes are separate. Males and females can be easily identified. Elaborate the organs of male reproductive system with the help of a labelled diagram. Why are testes located outside the abdominal cavity in humans ?[5+2+1]
OR
Eyes facilitate binocular vision. Draw V.S. of human eye and explain the structure. "Blind spot in the eye is devoid of the ability of vision". Justify. [2+5+1]

NEB Biology Question Paper Class 12 of 2081-2024.

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