Paper II — Q2
(a) Explain the formation of Foetal membranes in mammals with the help of suitable diagrams. (20 marks) (b) Discuss the…
(a) Explain the formation of Foetal membranes in mammals with the help of suitable diagrams. (20 marks) (b) Discuss the properties of an ideal antimicrobial agent. Write about the classification of antimicrobial agents. (20 marks) (c) Discuss in brief the housing requirements for pregnant cows and milking cows. (10 marks)
हिंदी में प्रश्न पढ़ें
(a) स्तनधारियों में भ्रूण झिल्लियों के निर्माण को उपयुक्त चित्रों की सहायता से समझाइये । (20 अंक) (b) एक आदर्श रोगाणुरोधी प्रतिनिधि (एजेंट) के गुणों की चर्चा कीजिए । रोगाणुरोधी प्रतिनिधियों (एजेंटों) के वर्गीकरण के बारे में लिखिये । (20 अंक) (c) गर्भवती गायों और दूध देने वाली गायों के लिए आवास आवश्यकताओं पर संक्षेप में चर्चा कीजिए । (10 अंक)
Directive word: Explain
This question asks you to explain. 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 'explain' requires clear causal reasoning and step-by-step exposition. For part (a) (20 marks), allocate ~40% time/words to describe chorion, amnion, allantois and yolk sac formation with labelled diagrams; for part (b) (20 marks), spend ~35% on ideal properties (selective toxicity, spectrum, pharmacokinetics) followed by systematic classification; for part (c) (10 marks), reserve ~25% for comparative housing specifications. Structure: brief introduction → systematic part-wise treatment → integrated conclusion linking reproductive physiology, therapeutics and management.
Key points expected
- Part (a): Chronological development of foetal membranes from trophoblast differentiation; structure and functions of chorion (villous types), amnion (amniotic fluid dynamics), allantois (vascularization and urine storage), and yolk sac (haematopoiesis); species variations (diffuse, cotyledonary, zonary, discoidal placentation); diagrammatic representation with proper labelling
- Part (b): Ideal antimicrobial properties—selective toxicity, appropriate spectrum, favourable pharmacokinetics (ADME), stability, solubility, cost-effectiveness and resistance prevention; classification by mechanism (cell wall synthesis inhibitors, protein synthesis inhibitors, nucleic acid synthesis inhibitors, antimetabolites) and by spectrum (narrow, broad, extended)
- Part (b) continued: Specific examples—β-lactams, aminoglycosides, fluoroquinolones, sulphonamides; mention of WHO AWaRe classification relevance in Indian veterinary context
- Part (c): Housing for pregnant cows—individual calving pens (3.6m × 3.6m), loose housing with adequate lying space (3.5-4 sq.m/cow), non-slip flooring, ventilation (8-10 air changes/hour), isolation from milking herd; Housing for milking cows—tie-stall vs loose housing systems, milking parlour proximity, feed bunk space (60-70 cm/cow), heat stress management in tropical climates
- Part (c) continued: Biosecurity integration—foot baths, clean dry lying surfaces, transition cow management; reference to BIS/ICAR standards or NDDB dairy herd improvement protocols
Evaluation rubric
| Dimension | Weight | Max marks | Excellent | Average | Poor |
|---|---|---|---|---|---|
| Demand-directive understanding | 20% | 10 | For (a), provides sequential embryological explanation with cause-effect logic; for (b), distinguishes 'properties' from 'classification' without conflation; for (c), interprets 'brief' appropriately—concise yet complete comparative analysis | Addresses all directives but with uneven depth—either over-expands on classification while neglecting properties, or provides descriptive rather than explanatory treatment of membrane formation | Misinterprets directives—treats 'explain' as mere description, confuses properties with classification, or writes disproportionately on one part ignoring mark allocation |
| Content depth & accuracy | 25% | 12.5 | Embryological accuracy: cites correct gestational timelines (e.g., amnion complete by day 30-35 in cattle); antimicrobial specificity includes MBC/MIC concepts; housing specifications quote precise dimensions and ventilation rates from authoritative sources | Generally correct content with minor errors—e.g., confuses chorionic villi types, omits pharmacokinetic parameters, or gives approximate rather than standard housing measurements | Significant factual errors—wrong membrane derivatives, incorrect antimicrobial mechanisms (e.g., penicillin as protein synthesis inhibitor), or impractical housing dimensions |
| Structure & flow | 20% | 10 | Clear tripartite division with internal coherence; for (a), developmental sequence from fertilization to established placentation; for (b), logical progression from ideal criteria to taxonomic classification; for (c), systematic comparison using tables or parallel structure | Recognizable structure but with weak transitions; parts identifiable but internal organization haphazard—e.g., classification without clear hierarchical levels, or housing points as disconnected bullet list | Poorly demarcated parts, no discernible internal logic, or failure to label sections (a), (b), (c) causing examiner navigation difficulty |
| Examples / case-law / data | 20% | 10 | For (a), compares ruminant vs equine vs carnivore placentation types; for (b), cites specific drugs (enrofloxacin, ceftriaxone, sulphadimidine) and Indian regulatory context (Schedule H, Veterinary Council norms); for (c), references NDDB dairy housing guidelines or successful cooperative models (e.g., Amul pattern) | Generic examples without specificity—'penicillin' without type, 'antibiotics' without naming; housing mentions 'clean' without standards; no Indian context | No examples, or irrelevant examples; diagrams absent despite explicit requirement in part (a); completely decontextualized from Indian animal husbandry practices |
| Conclusion & analytical edge | 15% | 7.5 | Synthesizes across parts—links placental efficiency to antimicrobial transfer (pharmacokinetics in pregnancy), connects housing stress to immunocompromise and antimicrobial need; forward-looking note on precision livestock farming integration | Part-wise summation without cross-linking; restates main points without analytical elevation; no forward vision | Abrupt ending or missing conclusion; mere repetition of introduction; conclusion contradicts body content |
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