Old Question Paper 2068 – Biology | Science Class 11

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Biology - MosquitoOld is Gold | Biology
Old Question Paper of Biology
For: Science (Zoology + Botany)
Grade: XI | Year: 2068 (2011)
Subject Code: 114 ‘D’

Time:- 3 hrs. Full Marks:- 75 | Pass Mark: 27
Candidates are required to give their answers in their own words as far as practicable. The figures in the margin indicate full marks.

Group ‘A’ – Attempt all the questions.

1. Answer in very short (any seven): [7×1=7]
a) What is prokaryotic cell?
b) Define cell wall.
c) What is cyclosis?
d) Define binomial nomenclature.
e) What is coenocytic?
f) Define thallophytes.
g) What is rhizoids?
h) Define abiotic factor.
i) Define food chain.
j) What is acid rain?

2. Describe in short (any five): [5×3=15]
a) Describe the fatty acids.
b) Discuss the structure of golgi complex.
c) Describe the process of mitosis.
d) Elaborate the economic importance of fungi.
e) Describe the scalariform conjugation.
f) Discuss the carbon cycle in nature.
g) Describe the importance of structure of endoplasmic reticulum.

3. Describe the life cycle of Fern with alternation of gereration. [7.5]
OR
Describe the Cruciferae with necessary diagrams and give two examples of economic value of this family.
4. What is ecosystem? Describe in detail about the pond ecosystem. [8]

Group ‘B’ Zoology – Attempt all questions:

1. Answer any seven questions in short: [7×1=7]
a. Define molecular biology.
b. Name the branch of biology with the study of fossils.
c. How was the earth formed?
d. Who wrote the book “Origin of Species”?
e. What do you understand by taxonomic hierarchy?
f. What is Ostium?
g. What do you mean by speciation?
h. Name two wildlife reserves of Nepal.
i. Give the difference between reflex action and taxis.
j. Define the term nature conservation.

2. Describe any five questions in brief: [5×3=15]
a. The process of binary fission in Paramaceium.
b. Draw a well labeled diagram of T.S. of earthworm through Pharynx.
c. About the hibernation and aestivation.
d. Teeth of frog.
e. Write short note on the “use and disuse of organ”.
f. The effects of water pollution.
g. Migratory behavior of fishes.

3. Describe the structure of lung and explain the working mechanism in frog. [7.5]
OR
What is schizogony? Illustrate it with reference to the life cycle of Plasmidium vivax.
4. Discuss briefly the evolution of human being from his early ancestor to modern man. [8]

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