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This particular Assignment references the syllabus chosen for the subject of Life Science, for the January 2024 - December 2024 session. The code for the assignment is LSE-02 and it is often used by students who are enrolled in the B.Sc. Degree.
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1. Write short notes on the following:
(a) Stratification
(b) Photoperiodism
(c) Desertification
(d) Biome
(e) Ecotone
(f) Keystone Species
(g) Domestication
(h) Bioindicators of pollution
2. Classify the aquatic organisms and describe the factors limiting the productivity of aquatic habitats.
3. Describe various components of ecosystem.
4. (a) Why pyramid of numbers are sometimes inverted whereas energy pyramids are never inverted? Explain in detail.
(b) Describe the various limitations of ecological pyramid.
5. (a) Explain the nitrogen cycle with a help of a well labeled diagram.
(b) Describe the human impact on nitrogen cycle and sulfur cycle.
6. Give an example that illustrates each of the following:
a) Primary succession
b) Secondary succession
c) Progressive succession
d) Retrogressive succession
1. (a) Define the following:
(i) Community
(ii) Xerophytes
(iii) Primary production
(iv) Biosphere
(b) Write short notes on:
(i) Ecological pyramids
(ii) Tolerance range
(iii) Importance of forests
2. (a) Describe in brief abiotic and biotic components of ecosystem.
(b) Describe the structural features of hydrophytes.
3. (a) Explain the structure of soil profile with the help of a well labeled diagram.
(b) Describe the major functions of soil biota.
4. Differentiate between:
(i) Food chain and Food web
(ii) Lentic and lotic ecosystems
(iii) Primary and secondary succession
(iv) Extinct and threatened species
5. Describe carbon cycle with the help of a well labelled diagram.
6. (a) What is desertification? What are the major reasons leading to desertification?
(b) Describe the various steps involved in the process of succession of a water body.
7. (a) What are keystone species? Explain their importance giving a suitable example.
(b) Describe the major threats that affect wildlife.
8. Describe in brief:
(i) Red data book
(ii) Fidelity
(iii) Benefits of grasslands
(iv) Deforestation
(v) Eutrophication
9. Explain in detail why wildlife conservation is important?
10. (a) Describe the effects of air pollution on plants.
(b) Describe energy flow in an ecosystem.
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