Zoology 2021 Paper I 50 marks 150 words Compulsory Write short notes

Q5

Write notes on the following in about 150 words each : (a) Vermiculture (10 marks) (b) FISH (10 marks) (c) Biological clock (10 marks) (d) Ecological succession (10 marks) (e) Biodiversity hotspots (10 marks)

हिंदी में प्रश्न पढ़ें

निम्नलिखित में से प्रत्येक पर लगभग 150 शब्दों में टिप्पणी लिखिए : (a) कृमि संवर्धन/केंचुआ संवर्धन (वर्मीकल्चर) (10 अंक) (b) एफ० आई० एस० एच० (10 अंक) (c) जैविक घड़ी (10 अंक) (d) पारिस्थितिकीय अनुक्रमण/उत्तरवर्तन (10 अंक) (e) जैव विविधता हॉटस्पॉट (10 अंक)

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Directive word: Write short notes

This question asks you to write short notes. 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 'Write notes' demands concise, information-dense responses for each sub-part. Allocate approximately 150 words per sub-part (equal marks distribution), spending roughly 6-7 minutes each. Structure each note with: (1) precise definition, (2) key mechanisms/processes, (3) 1-2 specific examples, and (4) applied significance. No elaborate introduction or conclusion needed; prioritize factual accuracy and technical terminology over narrative flow.

Key points expected

(a) Vermiculture: Define as earthworm-mediated organic waste decomposition; mention Eisenia fetida/E. eugeniae as species; note vermicompost nutrient profile (NPK values); cite Indian applicability (NCSU/ICAR technologies for rural waste management)
(b) FISH: Define Fluorescence In Situ Hybridization as molecular cytogenetic technique; explain probe binding to target DNA sequences; applications in karyotyping, cancer diagnostics, prenatal screening; mention Indian research (CCMB Hyderabad work on chromosomal abnormalities)
(c) Biological clock: Define circadian rhythm endogenous timing; explain SCN (suprachiasmatic nucleus) as mammalian pacemaker; mention clock genes (per, cry, bmal1); cite chronobiology applications (jet lag, shift work disorders, melatonin therapy)
(d) Ecological succession: Distinguish primary vs. secondary succession; explain pioneer species, seral stages, climax community; mention Indian examples (volcanic Barren Island colonization, deforested Western Ghats recovery)
(e) Biodiversity hotspots: Define Myers' criteria (endemic species + habitat loss); name Indo-Burma, Western Ghats/Sri Lanka, Himalaya as Indian hotspots; mention species endemism data; note conservation significance (protected area networks)

Evaluation rubric

Dimension	Weight	Max marks	Excellent	Average	Poor
Concept correctness	20%	10	All five sub-parts demonstrate precise, technically accurate definitions: vermiculture as biotechnological process not merely 'worm farming'; FISH correctly identified as cytogenetic not immunological technique; biological clock mechanism correctly attributed to transcription-translation feedback loops; succession types rigorously distinguished; hotspot criteria accurately stated as 1500 endemic vascular plants + 70% habitat loss	Definitions broadly correct but with minor technical errors: vermiculture conflated with general composting; FISH purpose described vaguely as 'DNA testing'; biological clock reduced to 'internal timer' without mechanism; primary/secondary succession distinction unclear; hotspot definition missing quantitative criteria	Fundamental conceptual errors: vermiculture described as ant/termite culture; FISH confused with PCR or ELISA; biological clock attributed to pineal gland alone without SCN; succession presented as purely random; hotspots equated with any high-biodiversity area
Diagram / labelling	15%	7.5	At least two appropriate diagrams across the five parts: FISH schematic showing probe hybridization to metaphase chromosomes; biological clock feedback loop diagram (per/cry inhibition of CLOCK/BMAL1); OR succession seral stage progression; diagrams properly labelled with technical accuracy	One relevant diagram present but with incomplete labelling; OR textual descriptions substitute for diagrams without visual representation; diagrams attempted but with anatomical/positional errors	No diagrams attempted where clearly applicable (FISH, biological clock mechanism, succession); OR diagrams entirely irrelevant to stated topics; diagrams present but completely unlabelled
Examples & nomenclature	25%	12.5	Each sub-part includes specific nomenclature: (a) Eisenia fetida/Perionyx excavatus with vermicompost NPK values; (b) specific probe types (centromeric, locus-specific, whole chromosome paints) with disease applications (CML, DiGeorge syndrome); (c) specific clock genes (CLOCK, BMAL1, PER1-3, CRY1-2); (d) Indian seral examples (lichens on lava, Imperata grasslands to Dipterocarp forest); (e) exact hotspot names with endemism statistics (Western Ghats: 325 endemic vertebrates)	Examples present but generic: 'earthworms' without species names; FISH applications listed without specific diseases; clock genes mentioned as 'period genes' without specificity; succession examples from non-Indian contexts; hotspots named without quantitative data	No specific examples or nomenclature; vermiculture species completely wrong; FISH applications absent; biological clock lacks any gene/protein names; succession without any named species; hotspots confused with biodiversity-rich countries
Process explanation	20%	10	Clear mechanistic explanations: vermiculture details gut enzyme action (cellulase, chitinase) and cast formation; FISH explains denaturation, hybridization, detection steps; biological clock describes TTFL with phase delay/advance; succession explains facilitation/tolerance/inhibition models; hotspots explain why endemism correlates with habitat fragmentation vulnerability	Processes described as sequential lists without mechanistic causation: vermiculture as 'worms eat waste'; FISH as 'probe finds DNA'; biological clock as 'genes turn on and off'; succession as 'plants replace plants'; hotspots as 'many species live there'	No process explanation attempted; OR completely incorrect mechanisms (vermiculture as bacterial fermentation alone; FISH as PCR amplification; biological clock as purely behavioral; succession as predetermined goal-directed; hotspots as human-designated without biological basis)
Evolutionary / applied context	20%	10	Strong applied and evolutionary framing: vermiculture linked to Swachh Bharat, organic farming, carbon sequestration; FISH connected to precision medicine, genetic counseling services in India; biological clock tied to chronotherapeutics, agricultural pest management timing; succession applied to ecological restoration ( mined land reclamation, coral reef rehabilitation); hotspots linked to CBD Aichi targets, India's National Biodiversity Action Plan, payment for ecosystem services	Applied context mentioned superficially: vermiculture as 'good for soil'; FISH as 'helps diagnosis'; biological clock as 'affects health'; succession as 'shows nature heals'; hotspots as 'need protection' without policy linkage	No applied or evolutionary context; OR purely descriptive treatment without significance; vermiculture as hobby activity; FISH as research tool only without clinical relevance; biological clock as curiosity; succession as academic abstraction; hotspots as tourism destinations

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