BBYCT-133 · December 2025 · English
IGNOU BBYCT-133 December 2025 Previous Year Question Paper
Plant Ecology And Taxonomy
Structured previous year question paper for BBYCT-133, December 2025 session.
Max marks: 50 · Questions: 7
Verified: 29 Jul 2026
B. SC. (GENERAL)
(BSCG/BSCM)
Term-End Examination
December, 2025
BBYCT-133 : PLANT ECOLOGY AND
TAXONOMY
Time : 2 Hours Maximum Marks : 50
(ii) Question No. 1 is compulsory.
(iii) Draws neat~—s and well-labelled
diagrams wherever necessary.
Q1.(a) Define any three of the following : 3x1=3 G) Psammosere
(ii) Keystone species Gii) Paraphyletic group
(iv) Polyclaves
(b) Fill in the blanks : 4x1=4
(i) Plants which complete their life cycle within a few weeks during availability of rain are called Gi) The parameter representing summation of relative frequency, relative density and_ relative abundance is termed 88 - -
(iii) The type of pollengrain present in the first flowering plants is
(iv) The system which classifies organisms on the basis of shared ancestry is शपा6ते 88 ---० «
(c) State whether the following statements are True or False : 3x1=3
(i) Plants of arctic and alpine regions are termed as Microtherms.
(ii) Standing crop biomass refers to the amount of organic matter in an area at a given time.
(ii) Indian Botanical Garden at West Bengal is presently called Acharya Jagadish Chandra Bose Indian Botanical Garden.
Q2.Describe any two of the following: 2x5=10
(a) Phosphorus cycle
(b) Adaptations in aquatic plants
(c) Characteristics of an ideal key in taxonomy
(d) Principles defining the International Code of Nomenclature
Q3.Give detailed accounts of any two of the following : 2x5=10
(a) Theories of endemism and endemism richness calculation
(b) Energy flow models of ecosystem
(c) Merits and demerits of Bentham and Hooker’s system of classification
Q4.Discuss the different layers in soil horizon. Add a brief account on water holding capacity and cation exchange capacity of soil. 5+244+2*
Q5.Discuss the different analytical characters of a community. What is ecotone ?
Q6.(a) How does phytochemistry serve as sound evidence of taxonomic studies ? 7
(b) What are the basic principles of binomial nomenclature ?
Q7.Write short notes on any four of the following : 4x2°=10
(a) Numerical and structural attributes of a population
(b) Tundra and Taiga
(c)_ Role of a Botanical Garden
(d) Box-in-Box concept and Dendrogram concept of taxonomic hierarchy
(e) Light zones in a freshwater lake 32158 yarn By 3x1=3 2x5=10 4x2°=10 (@) et aig oT