Previous Year Questions
2025
ZOOLOGY — HONOURS
Paper : DSCC-8
(Ecology)
Full Marks : 75
Section - A
1. Answer any ten questions :
2 × 10
(a) Why are energy pyramids always upright?
(b) What is Allen's rule?
(c) What is Minamata disease?
(d) Distinguish between major and minor communities.
(e) Define gross primary productivity and net primary productivity.
(f) What is realized natality?
(g) State the Law of limiting factors.
(h) Distinguish between static and functional food webs.
(i) What is ecotone?
(j) State two symptoms of arsenic poisoning in humans.
(k) Differentiate primary succession and secondary succession.
(l) What is carrying capacity?
(m) State the characteristic features of climax community.
(n) State two important climatic conditions of tropical rainforest.
(o) What is character displacement?
Section - B
2. Write short notes on any three of the following :
5 × 3
(a) Eltonian pyramids and its types.
(b) Type I and Type II survivorship curves.
(c) Vertical stratification of forest community.
(d) Seral stages of hydrosere.
(e) Sigmoid growth curve of population.
Section - C
Answer any four questions.
3. (a) Explain the Y-shaped energy flow model with the help of a suitable illustration.
(b) State the competitive exclusion principle. Describe Gause's experiment which supported this principle. (3+2)+(1+4)
(b) State the competitive exclusion principle. Describe Gause's experiment which supported this principle. (3+2)+(1+4)
4. (a) Distinguish between autecology and synecology.
(b) State important differences between r and k selected species.
(c) Write a brief note on photochemical smog. 3+4+3
(b) State important differences between r and k selected species.
(c) Write a brief note on photochemical smog. 3+4+3
5. (a) Write the causes and effects of Ozone layer depletion.
(b) What is meant by ecological succession? Distinguish between autogenic and allogenic succession.
(c) What is biotic potential? 4+(2+2)+2
(b) What is meant by ecological succession? Distinguish between autogenic and allogenic succession.
(c) What is biotic potential? 4+(2+2)+2
6. (a) Briefly discuss trophic niche and spatial niche with the help of suitable examples.
(b) Define 'wetlands'. Give two examples of wetland in India. Add a note on its ecological importance. 4+(2+1+3)
(b) Define 'wetlands'. Give two examples of wetland in India. Add a note on its ecological importance. 4+(2+1+3)
7. (a) Write the causes of eutrophication.
(b) Write a brief note on biological nitrogen fixation. Comment on the importance of nitrogen cycle in nature. 4+(4+2)
(b) Write a brief note on biological nitrogen fixation. Comment on the importance of nitrogen cycle in nature. 4+(4+2)
8. (a) Write and explain the Lotka Volterra's equation for competition.
(b) Distinguish between dispersion and dispersal.
(c) What is trophic efficiency? 4+4+2
(b) Distinguish between dispersion and dispersal.
(c) What is trophic efficiency? 4+4+2
9. (a) Distinguish between species richness and species evenness.
(b) Write the types of age pyramids.
(c) Explain the causes of acid rain. 4+3+3
(b) Write the types of age pyramids.
(c) Explain the causes of acid rain. 4+3+3
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