Medical Science 2021 Paper I 50 marks Describe

Q2

(a) Describe the prostate under the following headings: (i) Gross features (ii) Lobes (iii) Capsules and ligaments (iv) Blood supply (v) Lymphatic drainage (vi) Age changes 15 marks (b) Describe the key events occurring in the ovarian cycle with reference to their hormonal basis. Enumerate the diagnostic tests for ovulation. 15 marks (c) (i) Discuss the principle and steps involved in Polymerase Chain Reaction (PCR). Mention any five of its applications in clinical medicine. 10 marks (ii) Write a note on different vitamers of vitamin B₆ and write their biochemical role in cellular metabolism. 10 marks

हिंदी में प्रश्न पढ़ें

(a) निम्नलिखित शीर्षकों के अंतर्गत पुरःस्थ का वर्णन कीजिए : (i) सकल विशेषताएं (ii) खंड (iii) संपुट और स्नायु (iv) रक्त आपूर्ति (v) लसिका जल-निकासी (vi) उम्र के साथ होने वाले परिवर्तन 15 (b) डिंबाशयी चक्र में घटित होने वाली प्रमुख घटनाओं का, उनके हार्मोनल आधार का संदर्भ देते हुए, वर्णन कीजिए। उन नैदानिक जाँचों के नाम गिनाइए, जिनसे डिंबसरण का पता लगाया जा सकता है। 15 (c) (i) पॉलीमेरेज़ मृदुकला अभिक्रिया (पी० सी० आर०) का सिद्धांत और उसके चरणों की व्याख्या कीजिए। चिकित्सकीय मेडिसिन में पी० सी० आर० के किन्हीं पाँच उपयोगों का उल्लेख कीजिए। 10 (ii) विटामिन B₆ के विभिन्न विटामरों पर एक टिप्पणी लिखिए तथा कोशिकीय चयापचय में उनकी जैव रासायनिक भूमिका लिखिए। 10

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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' demands comprehensive, structured coverage of anatomical, physiological and biochemical facts across all sub-parts. Allocate approximately 30% time/words to part (a) prostate anatomy, 30% to part (b) ovarian cycle, 20% to part (c)(i) PCR, and 20% to part (c)(ii) vitamin B₆. Structure with clear headings matching the question, use diagrams for prostate zones and ovarian cycle phases, and conclude with clinical relevance for each section.

Key points expected

  • Prostate: five lobes (anterior, posterior, middle, two lateral), true and false capsules, prostatic venous plexus, benign prostatic hyperplasia affecting middle lobe
  • Ovarian cycle: follicular phase (FSH dominance, estrogen rise), ovulation (LH surge), luteal phase (progesterone dominance); diagnostic tests include basal body temperature, LH kit, ultrasound follicular tracking, progesterone day-21, endometrial biopsy
  • PCR: denaturation (94-95°C), annealing (50-65°C), extension (72°C) with Taq polymerase; applications include HIV viral load, TB diagnosis, COVID-19 RT-PCR, genetic screening, forensic DNA profiling
  • Vitamin B₆ vitamers: pyridoxine, pyridoxal, pyridoxamine and their phosphorylated forms; role as coenzyme in transamination (PLP), decarboxylation, heme synthesis (ALA synthase), neurotransmitter synthesis
  • Age changes in prostate: pubertal growth under androgens, BPH after 50 years, carcinoma common in peripheral zone, prostatic calculi

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Accurately describes all six prostate subdivisions including McNeal zonal anatomy; correctly sequences ovarian cycle hormones with precise feedback mechanisms; explains PCR thermocycling with exact temperatures; distinguishes all three B₆ vitamers with correct biochemical reactionsCovers basic prostate lobes but confuses zonal anatomy; describes ovarian phases with minor hormonal errors; states PCR steps without temperatures; mentions B₆ forms without clear functional distinctionConfuses prostate lobes/zones; misrepresents ovarian feedback (e.g., FSH surge for ovulation); omits key PCR steps; fails to identify vitamers or their coenzyme roles
Clinical correlation20%10Links prostate anatomy to BPH site (middle lobe/transition zone) and carcinoma site (peripheral zone); connects ovarian cycle to infertility workup and contraception; cites PCR in Indian TB diagnosis (CBNAAT) and COVID-19 pandemic; relates B₆ deficiency to isoniazid neuropathy and sideroblastic anemiaMentions BPH and prostate cancer without zonal specificity; lists ovulation tests without clinical context; gives generic PCR applications; notes B₆ deficiency without drug interactionNo clinical applications cited; fails to mention BPH, infertility diagnostics, or B₆ therapeutic uses; omits PCR relevance entirely
Diagram / pathway20%10Draws labeled coronal section of prostate showing zones and urethral relations; sketches ovarian cycle with hormonal graph (FSH, LH, estrogen, progesterone); illustrates PCR amplification curve; depicts PLP-dependent transamination mechanismDescribes diagrams in text without clear labels; draws basic ovarian cycle without hormonal overlay; mentions PCR steps linearly without schematicNo diagrams described or attempted; purely narrative description of spatial/anatomical relationships
Differential / staging15%7.5Differentiates BPH from prostate cancer by zone of origin and pathology; distinguishes anovulatory from ovulatory cycles by hormonal patterns and endometrial changes; differentiates PCR variants (RT-PCR, qPCR, nested PCR) with specific clinical indications; contrasts B₆ vitamers by tissue distribution and metabolic activationStates BPH vs cancer without zonal detail; lists ovulation tests without differentiating their diagnostic utility; mentions PCR types without distinction; notes vitamers exist without comparing themNo differentials attempted; conflates distinct entities (e.g., BPH with prostatitis); fails to distinguish PCR methodologies
Management / public-health angle20%10Discusses PSA screening controversies and prostate cancer prevention; addresses ovulation induction protocols for PCOS-related infertility in Indian context; evaluates PCR-based point-of-care diagnostics for TB elimination (NIKSHAY); discusses B₆ supplementation in pregnancy (anemia prevention) and anti-TB therapy prophylaxis under RNTCPMentions PSA testing without screening debate; notes fertility treatments generally; cites PCR for COVID-19 without public health strategy; states B₆ supplementation without programmatic contextNo public health or management perspective; omits screening, prevention, or national program relevance entirely

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