Q8
(a)(i) What are allosteric enzymes ? Explain in detail on the allosteric enzyme modulation. 8 (a)(ii) Describe the process of gluconeogenesis and its significance. 7 (b) What is environmental management ? Discuss various control measures to minimize environmental pollution. 20 (c) Differentiate between mutualism and commensalism by citing two examples for each of them. 15
हिंदी में प्रश्न पढ़ें
(a)(i) एलोस्टेरिक प्रकिण्व (एंजाइम) क्या हैं ? एलोस्टेरिक प्रकिण्व (एंजाइम) मॉड्यूलेशन को विस्तार पूर्वक समझाइए । 8 (a)(ii) ग्लूकोनियोजेनेसिस की प्रक्रिया तथा इसके महत्व का वर्णन कीजिए । 7 (b) पर्यावरण प्रबंधन क्या है ? पर्यावरण प्रदूषण को न्यूनतम करने में सहायक विधियों का वर्णन कीजिए । 20 (c) प्रत्येक के दो उदाहरण देते हुए सहोपकारिता तथा सहभोजिता में अंतर स्पष्ट कीजिए । 15
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' demands clear exposition of mechanisms and relationships across all parts. Allocate approximately 30% of time/words to part (b) (20 marks) on environmental management, 25% to part (a) (15 marks combined) covering allosteric enzymes and gluconeogenesis, and 25% to part (c) (15 marks) on ecological interactions. Structure with brief definitions, detailed mechanistic explanations, and concluding significance statements for each sub-part.
Key points expected
- Part (a)(i): Definition of allosteric enzymes; regulatory (allosteric) site vs active site; positive and negative modulation with examples (e.g., phosphofructokinase, aspartate transcarbamoylase); cooperative binding and sigmoid kinetics; T-state/R-state conformational changes
- Part (a)(ii): Gluconeogenesis pathway overview; key bypass reactions (pyruvate carboxylase/PEPCK, F-1,6-bisphosphatase, G-6-phosphatase); energy cost; significance in fasting, starvation, and Cori cycle
- Part (b): Definition and scope of environmental management; air pollution control (CNG in Delhi, BS-VI norms, electrostatic precipitators); water pollution control (Ganga Action Plan, STPs, zero liquid discharge); solid waste management (Swachh Bharat, waste segregation, bioremediation); legislative frameworks (EPA 1986, Water Act 1974)
- Part (c): Clear distinction between mutualism (obligate/facultative, both species benefit) and commensalism (one benefits, other unaffected); mutualism examples: mycorrhizae (Glomus-Pinus), legume-Rhizobium symbiosis or lichens; commensalism examples: epiphytic orchids on trees, barnacles on whales or cattle egrets with livestock
Evaluation rubric
| Dimension | Weight | Max marks | Excellent | Average | Poor |
|---|---|---|---|---|---|
| Concept correctness | 25% | 12.5 | Accurately defines allosteric enzymes with regulatory site distinction; correctly identifies gluconeogenesis as reversal of glycolysis with three irreversible bypasses; precisely defines environmental management as systematic approach; correctly distinguishes mutualism (reciprocal benefit) from commensalism (unilateral benefit, no harm) | Basic definitions correct but confuses allosteric inhibition with competitive inhibition; mentions gluconeogenesis without specifying bypass enzymes; generic pollution control listing; vague distinction between mutualism and commensalism with overlapping examples | Fundamental errors like equating allosteric with isoenzymes; describes glycolysis instead of gluconeogenesis; conflates environmental management with environmental science; cannot differentiate mutualism from commensalism or gives incorrect examples |
| Diagram / labelling | 15% | 7.5 | Draws sigmoid vs hyperbolic kinetic curves for allosteric enzymes; sketches gluconeogenesis pathway with mitochondrial/cytosolic compartmentalization; includes flowchart for integrated pollution control; illustrates mycorrhizal structure or epiphytic attachment with clear labelling | Mentions diagrams without drawing; draws incomplete kinetic curves; basic pathway sketch without enzyme names; simple pollution control flowchart; rough sketches of ecological interactions without structural detail | No diagrams despite requirement for visual explanation; incorrect curve shapes (Michaelis-Menten for allosteric enzyme); missing or wrong labels on any diagram provided |
| Examples & nomenclature | 20% | 10 | Names specific allosteric enzymes (phosphofructokinase-1, ATCase) with modulators (ATP/AMP, CTP/ATP); cites Indian environmental initiatives (Namami Gange, National Clean Air Programme); uses correct binomials (Rhizobium leguminosarum, Vanda tessellata) and specifies obligate vs facultative mutualism | Generic enzyme names without specific modulators; mentions some pollution control measures without Indian context; common names for species; one correct example per category with minor errors | No specific enzyme or modulator names; no Indian examples for environmental management; incorrect or invented species names; examples that actually illustrate parasitism or competition instead |
| Process explanation | 20% | 10 | Detailed T-state/R-state conformational explanation with sequential vs concerted models; stepwise gluconeogenesis with energy accounting (6 ATP equivalents); systematic pollution control hierarchy (prevention, treatment, disposal); clear mechanism of nutrient exchange in mycorrhizae | Basic conformational change mentioned without models; pathway listed without energy costs; pollution measures listed without prioritization; general description of species interactions without mechanism | No mechanistic detail for allosteric regulation; confuses gluconeogenesis with glycogenolysis; only lists pollution effects not control measures; describes examples without explaining how mutualism/commensalism functions |
| Application / ecology | 20% | 10 | Links allosteric regulation to metabolic flux control in diabetes; connects gluconeogenesis to clinical conditions (von Gierke disease, type 2 diabetes); evaluates environmental management success in India (CNG mandate results, Ganga water quality trends); analyzes ecological interaction stability and coevolutionary aspects | Brief mention of metabolic significance; lists pollution control without evaluation; states ecological importance without analysis; generic statements about environmental protection | No connection to real-world applications; no evaluation of environmental measures; no ecological significance discussed; purely theoretical treatment with no context |
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