Geology 2022 Paper I 50 marks Elucidate

Q6

(a) Elucidate the evolutionary trend of Hominidae with examples of Indian occurrence. (20 marks) (b) Describe the Palaeozoic sequence of Kashmir Valley with fossils content. (15 marks) (c) Describe the surface investigation methods of groundwater. (15 marks)

हिंदी में प्रश्न पढ़ें

(a) होमिनिडी की विकासीय प्रवृत्ति का वर्णन कीजिए तथा इनकी उपलब्धता भारतीय उदाहरणों के साथ बताइए। (20 अंक) (b) कश्मीर घाटी के पुराजीवी महाकल्प अनुक्रम का जीवाश्मों सहित वर्णन कीजिए। (15 अंक) (c) भूमजल की सतह अन्वेषण विधियों का वर्णन कीजिए। (15 अंक)

Evaluate your answer to this question → See all 2022 Geology questions

Directive word: Elucidate

This question asks you to elucidate. 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 'elucidate' demands clear, illuminating explanation with examples. Allocate approximately 40% of time/words to part (a) given its 20 marks, 30% each to parts (b) and (c). Structure: brief introduction framing Hominidae evolution, then systematic treatment of (a) with Indian fossil sites, followed by stratigraphic description for (b) and methodological exposition for (c). Conclude with integrated remarks on Quaternary geology's applied value.

Key points expected

  • Part (a): Evolutionary trajectory from Dryopithecus through Australopithecus, Homo habilis, H. erectus to H. sapiens with cranial capacity trends and bipedalism milestones
  • Part (a): Indian occurrences—Hathnora (Narmada) H. erectus calvarium, Bhimbetka rock shelters, Mehrgarh Neolithic evidence; Siwalik hominoid fossils (Ramapithecus/Sivapithecus)
  • Part (b): Kashmir Palaeozoic sequence—Trematops (Devonian) fish beds, Muth Quartzite (Permian), Panjal Volcanics interbeds; marker fossils like Productus, Spirifer, Fenestella
  • Part (c): Surface investigation methods—geological mapping, remote sensing (satellite imagery, aerial photos), geophysical methods (resistivity, seismic refraction), hydrogeological surveys
  • Part (c): Specific techniques—electrical resistivity profiling for aquifer geometry, pumping tests for transmissivity, tracer studies for groundwater flow direction

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness25%12.5Accurately distinguishes hominid vs hominoid taxonomy; correctly identifies Kashmir stratigraphic succession (oldest to youngest); precisely describes resistivity method principles and aquifer parametersBasic evolutionary sequence correct but conflates Ramapithecus with hominid ancestry; Kashmir sequence broadly correct but fossil zonation imprecise; groundwater methods listed without explaining scientific basisConfuses H. erectus with H. sapiens; misorders Kashmir formations (places Panjal Volcanics below Muth Quartzite); describes drilling as 'surface investigation' or confuses resistivity with seismic methods
Diagram / cross-section20%10Draws cranial capacity evolution graph for (a); Kashmir Valley generalized stratigraphic column with fossil ranges for (b); resistivity sounding curve with layer interpretation for (c)One relevant diagram (typically stratigraphic column for Kashmir) with basic labelling; mentions diagrams for other parts but not executedNo diagrams despite clear need; or diagrams with fundamental errors (e.g., inverted stratigraphy, mislabelled axes on resistivity plot)
Field evidence20%10Cites specific specimens: Hathnora calvarium (Sonakia), Bhimbetka Acheulian tools, Mehrgarh dental evidence; Kashmir fossil localities (Liddar Valley, Vihi); groundwater case studies from CGWB reportsMentions Narmada and Bhimbetka generally without specimen details; Kashmir fossils named but localities vague; groundwater methods described generically without field contextNo specific fossil sites named; 'Kashmir has old rocks' level generality; groundwater investigation described as purely office-based
Quantitative reasoning15%7.5Provides cranial capacity ranges (e.g., Australopithecus ~400-500 cc, H. erectus ~900 cc, H. sapiens ~1350 cc); mentions resistivity values for different lithologies (sandstone vs shale); aquifer transmissivity/storativity parametersQualitative trends mentioned ('brain size increased') without numbers; resistivity method described without typical values; no hydrogeological parametersNo quantitative data anywhere; or invented/incorrect values that contradict established data
Indian / economic relevance20%10Connects Hathnora fossil to understanding Indian Pleistocene chronology; links Kashmir stratigraphy to hydrocarbon source rock potential (Permian); emphasizes groundwater investigation for Bharat Mission and drought-prone regionsMentions Indian sites as examples without broader significance; notes Kashmir geology is 'important for resources' vaguely; groundwater importance stated genericallyTreats Indian occurrences as isolated curiosities; no economic or societal relevance drawn; or focuses on foreign examples (Olduvai, East African Rift) neglecting Indian context

Practice this exact question

Write your answer, then get a detailed evaluation from our AI trained on UPSC's answer-writing standards. Free first evaluation — no signup needed to start.

Evaluate my answer →

More from Geology 2022 Paper I