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BSc (VI Semester) Examination
BOTANY
Paper : BOT–361
( Environmental Biology and Biostatistics )
Full Marks : 80
Pass Marks : 35%
Time : Three Hours
Note : 1. All questions are compulsory.
2. The figures in the margin indicate full marks for the questions.
1. Define and briefly explain the following (any five) : 2×5=10
(a) Food web
(b) Ecorestoration
(c) Allogenic succession
(d) Greenhouse gases
(e) Sources of data
(f) Sedimentary cycle
(g) Ecological niche
(h) E-waste
2. Answer any six of the following : 5×6=30
(a) Explain endemism with suitable examples.
(b) Explain polyclimax theory.
(c) What is Student’s t-test?
(d) What is meant by ozone layer? What is its significance?
(e) Differentiate between point and non-point sources of pollution.
(f) Briefly discuss about the major biomes of the world.
(g) What is gross primary productivity? How does it differ from net primary
productivity?
(h) Describe vegetation types of North-East India.
(i) Write a note on nitrogen cycle.
(j) Discuss on causes and consequences of water pollution.
3. Answer any four of the following questions : 10×4=40
(a) Describe the different kinds of ecological pyramids.
(b) Discuss the structure of ecosystem by taking an example of pond ecosystem.
(c) What is community stratification? Discuss horizontal and vertical stratification with suitable examples.
(d) What is chi-square test? Calculate the median of the following series of data obtained by measuring the heights of 16 plants :
(f) Define ecological succession. Describe the causes and basic types
of succession.
(g) Describe major phytogeographical regions of India.
