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Animal Husbandry & Veterinary Science 2022 Paper I 50 marks Describe

Paper I — Q3

(a) Describe the role of chemoreceptors in regulation of respiration in avians. (15 marks) (b) Describe the different events of…

(a) Describe the role of chemoreceptors in regulation of respiration in avians. (15 marks) (b) Describe the different events of cardiac cycle in animals. (15 marks) (c) Describe the physiological functions of various digestive organs of sheep. (20 marks)

हिंदी में प्रश्न पढ़ें

(a) पक्षियों में श्वसन के नियमन में रसोत्पाही (कीमोरिसेप्टर) की भूमिका का वर्णन कीजिए। (15 अंक) (b) पशुओं में हृदय चक्र की विभिन्न घटनाओं का वर्णन कीजिए। (15 अंक) (c) भेड़ के विभिन्न पाचन अंगों की शारीरिक क्रियाओं का वर्णन कीजिए। (20 अंक)

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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' requires detailed, systematic exposition of physiological mechanisms across all three parts. Allocate approximately 30% time/words to part (a) on avian chemoreceptors, 30% to part (b) on cardiac cycle events, and 40% to part (c) on sheep digestive organs given its higher mark weightage. Structure with brief introductions for each part, followed by systematic anatomical-physiological descriptions, and conclude with integrated physiological significance across respiratory, cardiovascular and digestive systems.

Key points expected

  • Part (a): Location and classification of avian chemoreceptors (central vs peripheral); specific role of intra-pulmonary CO2 receptors, arterial chemoreceptors in domestic fowl; mechanism of hyperventilation response to hypoxia and hypercapnia
  • Part (b): Sequential events of cardiac cycle including atrial systole, isovolumetric contraction, rapid ejection, reduced ejection, isovolumetric relaxation, rapid filling, reduced filling phases; pressure-volume relationships and valve dynamics
  • Part (c): Rumen physiology including microbial fermentation, volatile fatty acid absorption, eructation mechanism; reticulum function in regurgitation and foreign body trapping; omasum water absorption and abomasum true gastric secretion; small and large intestine adaptations for cellulose digestion in ovines
  • Comparative physiological integration: How respiratory regulation supports cardiac output and digestive efficiency in ruminants and avians
  • Species-specific adaptations: Unidirectional airflow in avians affecting chemoreceptor distribution; four-compartment stomach evolutionary advantage in sheep; cardiac cycle variations across species

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Demand-directive understanding15%7.5Demonstrates precise understanding that 'describe' requires comprehensive anatomical-physiological detailing across all three parts; for (a) covers receptor morphology and neural pathways, for (b) includes pressure-volume loops and Wiggers diagram elements, for (c) distinguishes between forestomach and true stomach functions with fermentation kineticsProvides basic descriptions but misses species-specific details; treats (a), (b), (c) generically without avian, cross-species cardiac, or ovine specializations; confuses 'describe' with mere listingMisinterprets directive as 'explain' or 'compare' without descriptive depth; provides only sketchy outlines for one or more parts; fails to address all three sub-parts adequately
Content depth & accuracy30%15Accurate neuroanatomy of avian respiratory centers (pneumotaxic, apneustic centers); precise cardiac timing (0.1s atrial systole, 0.3s ventricular systole in mammals); quantitative rumen parameters (pH 6.0-7.0, 10^10-10^11 bacteria/ml, VFA production rates); cites contemporary research on vagal cooling in sheep thermoregulationGenerally correct but contains minor errors in cardiac phase durations, vague on chemoreceptor locations, or oversimplifies rumen microbiology; lacks quantitative backing for physiological claimsMajor factual errors such as confusing avian and mammalian respiratory control, incorrect valve sequences in cardiac cycle, or describing sheep stomach as simple monogastric; significant content gaps across parts
Structure & flow20%10Clear tripartite organization with distinct headings; within each part, logical progression from anatomy to physiology to regulation; effective transitions between respiratory, cardiovascular and digestive systems showing systemic integration; uses diagrams/schematic descriptions appropriatelyAll three parts present but uneven development; some organizational confusion within cardiac cycle description; abrupt shifts between parts without physiological connectivity; limited use of structural aidsDisorganized or missing part divisions; jumbled presentation of cardiac events; no systematic progression through digestive organs; reader cannot distinguish between (a), (b) and (c) responses
Examples / case-law / data20%10References specific studies: Schmidt-Nielsen's work on avian respiratory physiology; Indian research from IVRI Izatnagar on rumen fermentation patterns; data on cardiac output in Indian goat breeds (Barbari, Jamunapari); mentions NDDB findings on sheep methane emissions; cites FAO/ICAR standards for ovine digestive efficiencyGeneric references to 'studies show' without attribution; mentions common breeds (Merino, Suffolk) but not Indian context; limited quantitative data for rumen pH or cardiac parametersNo examples, data or research citations; relies entirely on textbook generalizations; fails to ground physiological descriptions in empirical evidence or Indian livestock context
Conclusion & analytical edge15%7.5Synthesizes how respiratory chemoregulation, cardiac efficiency and digestive specialization co-evolve in high-metabolic demand species; discusses applied relevance for poultry production in Indian climate, cardiac stress in transported sheep, precision livestock farming applications; identifies research gaps in indigenous breed physiologyBrief summary restating main points without synthesis; superficial mention of production relevance; no forward-looking research or policy implicationsAbsent or extremely brief conclusion; no integration across the three physiological systems; fails to demonstrate why understanding these mechanisms matters for animal husbandry practice

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