National Examinations Board (+2)
+2 Science (Class 11 and 12)
Class 12 · NEB 2081
Course Title: Biology (Bio)
Full Marks: 75Pass Marks: 27Time: 3 hrs
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.
Group B
Short answers questions.(4 × 4 = 16)
- 6.4
Define parenchyma tissue and explain its structure and function. [1+2+1]
- 7.4
Observe the diagram of a pollen grain and answer the questions given below. [figure in the original paper]
- 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 carries two male gametes. What is the purpose of carrying two male gametes when single gamete can fertilize the egg ? [2]
- 8.4
Explain the mechanism of incomplete dominance up to 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]
- 9.4
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. | 2 × 8 = 16
- 18.4
Compare and contrast between voluntary and involuntary muscles. [2+2]
- 19.4
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]
- 20.4
Study the given figure and answer the following questions. [figure in the original paper]
- 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]
- 21.4
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]
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