Botany 2021 Paper II 50 marks Describe

Q8

(a) What are the different types and causes of seed dormancy ? Describe various methods used to overcome it. Is it an ecological adaptation ? Explain. 10+5+5=20 (b) Describe the concept of sustainable development highlighting its objectives and importance. 15 (c) Describe in detail the endemism highlighting its categories, causes of endemism and conservation priorities. 15

हिंदी में प्रश्न पढ़ें

(a) बीज प्रसुप्तावस्था (प्रसुप्ति) के विभिन्न प्रकार एवं कारण क्या हैं ? इस पर काबू पाने हेतु विभिन्न विधियों का वर्णन कीजिए । क्या यह एक पारिस्थितिक अनुकूलन है ? व्याख्या कीजिए । 10+5+5=20 (b) सतत विकास की अवधारणा का वर्णन इसके उद्देश्यों एवं महत्व पर प्रकाश डालते हुए कीजिए । 15 (c) स्थानिकता का विस्तृत वर्णन, इसकी श्रेणियों, स्थानिकता के कारणों एवं संरक्षण प्राथमिकताओं को बताते हुए कीजिए । 15

Evaluate your answer to this question → See all 2021 Botany questions

Directive word: Describe

This question asks you to describe. 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 'describe' demands comprehensive, structured exposition across all three parts. Allocate approximately 40% of time/words to part (a) given its 20 marks, with 30% each to parts (b) and (c). Structure as: brief introduction linking seed biology to conservation → systematic treatment of (a) types/causes/methods/ecological significance → (b) sustainable development concept with Brundtland Report reference → (c) endemism categories with Indian examples → concluding synthesis on how dormancy research and endemism conservation contribute to sustainable development goals.

Key points expected

  • Part (a): Classification of seed dormancy into exogenous (physical, chemical), endogenous (physiological, morphological, morphophysiological), and combined dormancy with specific causal mechanisms
  • Part (a): Dormancy-breaking methods including scarification, stratification, hormonal treatments (GA3), and after-ripening with scientific rationale
  • Part (a): Ecological adaptation argument linking dormancy to bet-hedging strategy, gap detection, and seasonal synchronization in variable environments
  • Part (b): Brundtland Commission definition (1987), three pillars (economic, social, environmental), SDGs alignment, and importance for intergenerational equity
  • Part (c): Endemism categories (paleoendemism, neoendemism, schizoendemism, patroendemism, apoendemism) with distinguishing features
  • Part (c): Causes including geographical isolation, edaphic specialization, climatic stability, and evolutionary history; Indian hotspots (Western Ghats, Eastern Himalayas, Andaman-Nicobar)
  • Part (c): Conservation priorities including in-situ (biosphere reserves, national parks) and ex-situ (seed banks, cryopreservation) strategies for endemic flora

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness22%11Precisely defines dormancy types (exogenous/endogenous/combined), correctly distinguishes innate from induced dormancy, accurately presents Brundtland sustainable development definition with three pillars, and correctly classifies endemism categories with their evolutionary origins; no conceptual conflation between seed viability and dormancyCovers major dormancy categories but confuses physical with physiological dormancy; gives generic sustainable development definition without SDG linkage; lists endemism types but misclassifies examples or omits neo/paleo distinctionFundamental errors such as equating dormancy with seed death; omits or misrepresents sustainable development pillars; fails to distinguish endemism from rarity or confuses endemic with exotic species
Diagram / labelling14%7Includes clear schematic of seed coat structure showing water-impermeable layer for physical dormancy; flowchart of dormancy-breaking methods; or map showing Indian endemic hotspots with key species distribution; all diagrams properly labelled with anatomical/ geographical precisionIncludes one relevant diagram (seed structure or India map) with basic labelling but missing critical annotations like 'palisade layer' or 'Western Ghats biodiversity hotspot' boundariesNo diagrams despite visual potential; or crude unlabelled sketches; or irrelevant diagrams that do not illustrate dormancy mechanisms, sustainable development framework, or endemism patterns
Examples & nomenclature20%10Cites specific dormancy cases: Xanthium (physical), apple/rose (physiological), orchids (morphological); Indian endemics like Nepenthes khasiana (Meghalaya), Paphiopedilum druryi (Western Ghats), Saussurea obvallata (Brahma Kamal); references IPCC, CBD, IUCN Red List categoriesGeneral examples like 'legumes for hard seed coat' without species names; mentions Western Ghats as endemic region but no specific species; omits international conventions or uses outdated terminologyNo Indian examples for endemism; incorrect examples (e.g., citing wheat for dormancy when domesticated varieties lack it); misspelled scientific names or invented species; no reference to global conservation frameworks
Process explanation22%11Detailed mechanistic explanation: ABA/GA balance in physiological dormancy, embryo growth potential vs. mechanical resistance, enzymatic weakening of endosperm; scarification methods with physiological basis; sustainable development implementation pathways; speciation processes leading to endemismLists methods (stratification, scarification) without explaining hormonal or biochemical basis; describes sustainable development as abstract goal without operational mechanisms; mentions isolation as cause of endemism without allopatric speciation processMerely enumerates terms without process linkage; confuses cause and effect in dormancy induction; no explanation of how endemism arises through evolutionary mechanisms; procedural gaps in conservation strategy description
Application / ecology22%11Strong ecological synthesis: dormancy as adaptive bet-hedging in unpredictable climates with mathematical fitness arguments; seed banking (ex-situ) for endemic species conservation; Millennium Seed Bank Partnership; Indian National Gene Bank at NBPGR; link between endemic-rich hotspots and sustainable development targets (SDG 15)Mentions dormancy helps plants survive winter without broader ecological context; notes seed banks exist without naming Indian facilities; weak connection between endemism conservation and sustainable development implementationNo ecological adaptation argument for dormancy; no application to conservation practice; fails to connect any part of answer to sustainable development operationalization; ignores Indian institutional framework for germplasm conservation

Practice this exact question

Write your answer, then get a detailed evaluation from our AI trained on UPSC's answer-writing standards. Free first evaluation — no signup needed to start.

Evaluate my answer →

More from Botany 2021 Paper II