Botany 2021 Paper II 50 marks Discuss

Q7

(a) What is unique of Indian plant biodiversity ? Discuss briefly the threats and various conservation strategies. 5+15=20 (b) What is social forestry ? Explain its types and benefits. 5+10=15 (c) Give a brief account of ecological pyramids. Describe ecological factors and their significance in plants. 5+10=15

हिंदी में प्रश्न पढ़ें

(a) भारतीय पादप जैव-विविधता में अनोखा क्या है ? खतरों एवं विभिन्न संरक्षण रणनीतियों की संक्षेप में चर्चा कीजिए । 5+15=20 (b) सामाजिक वानिकी क्या है ? इसके प्रकारों एवं लाभों की व्याख्या कीजिए । 5+10=15 (c) पारिस्थितिक पिरामिडों का संक्षिप्त लेखा प्रस्तुत कीजिए । पौधों में पारिस्थितिक कारकों एवं उनके महत्व का वर्णन कीजिए । 5+10=15

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Directive word: Discuss

This question asks you to discuss. The directive word signals the depth of analysis expected, the structure of your answer, and the weight of evidence you must bring.

See our UPSC directive words guide for a full breakdown of how to respond to each command word.

How this answer will be evaluated

Approach

The directive 'discuss' demands a balanced, analytical treatment with critical evaluation across all three parts. Allocate approximately 40% of word budget to part (a) given its 20 marks, and roughly 30% each to parts (b) and (c). Structure with a brief introduction highlighting India's biodiversity significance, then address each sub-part sequentially with clear sub-headings, integrating diagrams where relevant, and conclude with forward-looking conservation synthesis.

Key points expected

  • Part (a): Indian plant biodiversity uniqueness—10 recognized biodiversity hotspots including Western Ghats and Eastern Himalayas; endemism (36% endemic to India); Vavilov's center of origin status for crop plants; megadiversity status with only 2.4% land area holding 8% of world's species
  • Part (a): Threats—habitat fragmentation, deforestation (1.5 million ha annually), invasive species (Lantana, Parthenium), overexploitation (medicinal plants like Taxus), climate change impacts on endemic montane flora; conservation strategies—in-situ (Biosphere reserves, 106 National Parks, 564 Wildlife Sanctuaries), ex-situ (NBPGR, FRI Dehradun, BSI gardens), CBD and Nagoya Protocol commitments
  • Part (b): Social forestry definition—community-based forest management on degraded/non-forest lands; types—farm forestry, community forestry, extension forestry (roadside, canal bank), urban forestry; benefits—fuelwood/fodder security, employment generation (30 million person-days annually), carbon sequestration, watershed protection, rural development
  • Part (c): Ecological pyramids—pyramid of number, biomass, energy; upright and inverted pyramids with conditions (e.g., inverted biomass pyramid in aquatic ecosystems); Lindeman's 10% law
  • Part (c): Ecological factors—abiotic (light, temperature, water, soil, topography) and biotic (competition, predation, symbiosis); significance in plant distribution, phenology, adaptation strategies (CAM, C4 photosynthesis), community structure and succession

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness22%11Precise definitions across all parts: correctly identifies India as one of 17 megadiversity countries with 10 hotspots; accurately distinguishes social forestry from joint forest management; correctly explains energy pyramid must always be upright while number/biomass pyramids can be inverted; no conceptual errors in factor classificationsGenerally correct definitions with minor inaccuracies—may confuse social forestry with agroforestry, or misstate pyramid exceptions; broadly accurate on biodiversity hotspots but misses Vavilov center conceptFundamental errors—confuses in-situ/ex-situ conservation, misidentifies pyramid types, or presents social forestry as solely government plantation program without community dimension
Diagram / labelling18%9Includes at least two well-drawn diagrams: ecological pyramids (upright and inverted examples with clear trophic levels labelled), and/or conservation strategy flowchart or social forestry institutional framework; neat, proportional, fully labelled with units where applicableOne relevant diagram present (typically pyramids) with basic labelling but missing units or trophic level details; or two diagrams with minor labelling omissionsNo diagrams despite explicit visual demand in part (c); or poorly sketched unlabelled figures that do not illustrate key concepts; diagrams contradict textual explanation
Examples & nomenclature20%10Rich, specific examples: endemic species (Nepenthes khasiana, Psilotum nudum in Eastern Himalayas); specific Biosphere Reserves (Nilgiri, Nanda Devi, Sunderban); social forestry success cases (Sukhomajri, Arabari); invasive species with scientific names; cites NBPGR, BSI, FRI institutions correctlySome relevant examples given but generic—mentions Western Ghats without specific endemic species, or names only common social forestry types without case studies; minor nomenclature errorsFew or no specific examples; incorrect or misspelled scientific names; confuses Indian institutions (e.g., states NBPGR is in Bangalore rather than New Delhi); no mention of flagship conservation programs
Process explanation20%10Clear mechanistic explanations: how habitat fragmentation leads to genetic erosion; step-by-step community participation process in social forestry; energy transfer efficiency calculations through trophic levels; factor interactions (e.g., temperature-moisture regimes determining vegetation zones)Describes processes in general terms without clear causal chains; mentions threats and strategies as lists rather than explaining mechanisms; basic pyramid construction without explaining why energy pyramids cannot be invertedNo process explanation—only lists or definitions; confuses causes and effects in biodiversity loss; fails to explain significance of ecological factors in plant adaptation
Application / ecology20%10Strong applied dimension: links conservation strategies to Aichi/Nagoya targets and India's NBSAP; evaluates social forestry against Joint Forest Management outcomes; applies ecological factor analysis to predict climate change impacts on Indian vegetation zones; suggests policy improvementsSome application mentioned—notes social forestry benefits for rural economy or states conservation importance, but lacks critical evaluation or forward-looking recommendations; basic mention of climate change without specific projectionsPurely theoretical treatment with no application to Indian context; no evaluation of strategy effectiveness; fails to connect ecological principles to conservation practice or agricultural productivity

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