Botany 2022 Paper I 50 marks Describe

Q8

(a) Describe the protocol involved in rooting and acclimatization of plants produced using in vitro culture. Elaborate on the various problems and solutions associated with this technique. 10+10=20 (b) Differentiate between direct and indirect organogenesis. Discuss the merits and demerits of each method. 15 (c) What are 'energy plantations'? Narrate the salient features of this energy alternative for the energy security of India. 15

हिंदी में प्रश्न पढ़ें

(a) पात्रे संवर्धन (इन विट्रो कल्चर) द्वारा उत्पादित पादपों की मूलोत्पत्ति (रूटिंग) एवं पर्यनुकूलन (एक्लिमटाइजेशन) की संलेख प्रणाली (प्रोटोकॉल) का विवरण दीजिए। इस विधि से संबंधित विभिन्न समस्याओं एवं समाधानों की विस्तृत व्याख्या कीजिए। 10+10=20 (b) प्रत्यक्ष एवं परोक्ष अंग-निर्माण (ऑर्गेनोजेनेसिस) में भेद कीजिए। प्रत्येक विधि के गुण एवं दोषों की विवेचना कीजिए। 15 (c) 'ऊर्जा वृक्षारोपण (एनर्जी प्लांटेशन)' क्या होता है? भारत की ऊर्जा सुरक्षा में इस ऊर्जा विकल्प की मुख्य विशेषताओं का उल्लेख कीजिए। 15

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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.

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How this answer will be evaluated

Approach

The directive 'describe' demands systematic, detailed exposition of protocols and processes. Structure: brief introduction on plant tissue culture significance → Part (a): stepwise rooting protocol (40% weight, 20 marks) covering auxin pulse, hardening stages, and acclimatization challenges like hyperhydricity and photoinhibition with solutions → Part (b): comparative table on direct vs indirect organogenesis (30% weight, 15 marks) analyzing merits/demerits including genetic stability and somaclonal variation → Part (c): energy plantations definition with Indian context (30% weight, 15 marks) featuring Jatropha, Pongamia, and National Mission on Sustainable Habitat. Conclude with integrated vision on biotechnology for sustainable development.

Key points expected

  • Part (a): Rooting protocol—auxin pulse treatment (IBA/NAA), ex vitro rooting, and staged acclimatization (primary to secondary hardening); problems include hyperhydricity, poor vascular connection, photooxidative stress; solutions: reduced humidity transition, activated charcoal, mycorrhizal inoculation
  • Part (a): Acclimatization physiology—functional stomata development, photosynthetic competence, root hair formation; controlled environment chamber (CEC) parameters: RH 90→60%, light intensity 2000→10000 lux gradual increase
  • Part (b): Direct organogenesis—shoot/ root formation from explant tissue without callus (pre-formed meristems), genetic stability, rapid multiplication; Indirect organogenesis—callus-mediated, higher multiplication rate but somaclonal variation risk; comparative table with examples: direct (Chrysanthemum, potato), indirect (sugarcane, rice)
  • Part (b): Merits/demerits analysis—direct: clonal fidelity, limited material; indirect: embryogenic potential, suitable for protoplast fusion, genetic transformation; cite somaclonal variation exploitation for disease resistance (sugarcane Fiji virus)
  • Part (c): Energy plantations—dedicated biomass cultivation for fuel/energy; species: Jatropha curcas, Pongamia pinnata, Simarouba glauca, bamboo (Dendrocalamus strictus); National Policy on Biofuels 2018, SATAT initiative for compressed biogas
  • Part (c): Energy security dimensions—wasteland utilization (20 Mha potential), rural employment, carbon neutrality, import substitution (target 20% ethanol blending by 2025); challenges: seed viability, oil content variability, land-use competition

Evaluation rubric

DimensionWeightMax marksExcellentAveragePoor
Concept correctness20%10Precise definitions: hyperhydricity mechanism (ethylene accumulation), somaclonal variation epigenetic basis, C3/C4 energy plantation physiology; correct auxin:cytokinin ratios for rooting (10:1); accurate distinction between hardening and acclimatizationGeneral understanding of tissue culture stages but confused terminology (e.g., mixing organogenesis with embryogenesis); vague on hormonal control; minor errors in energy plantation species classificationFundamental errors: calling callus a tissue type, confusing in vivo with in vitro, misidentifying energy plantations as conventional forestry; incorrect auxin roles
Diagram / labelling15%7.5Two quality diagrams: (a) acclimatization chamber cross-section with mist system, shade nets, humidity sensors labelled; (b) organogenesis pathways showing direct (shoot primordia from epidermis) vs indirect (callus→meristemoid→organ) with cellular detail; neat, captioned, scaledOne relevant diagram (acclimatization stages flowchart or organogenesis comparison) with partial labelling; hand-drawn acceptable but key structures unlabelledNo diagrams despite visual demand; or irrelevant sketches (micropropagation stages only); poor reproduction quality with no labels
Examples & nomenclature20%10Specific cultivars: 'Kufri Jyoti' potato for direct organogenesis; 'Co 86032' sugarcane for indirect; energy plantation: Jatropha IC-42 high-yielding variety, Pongamia IC-391034; institutions: NCL Pune (energy plantation research), NBPGR (germplasm); hormones: IBA, NAA, BAP with concentrationsGeneric examples (potato, sugarcane without varieties); Jatropha mentioned without cultivar; correct hormone abbreviations but no concentration rangesNo Indian examples; invented varieties; incorrect hormone names (e.g., 'auxin hormone' instead of specific); foreign-centric examples ignoring Indian programmes
Process explanation25%12.5Sequential logic: for (a) rooting—sterilized rooting medium → auxin pulse (100-200 μM IBA for 3-5 days) → root emergence → washing → transplant to cocopeat:vermiculite (1:1) → primary hardening (7-14 days) → secondary hardening (4-6 weeks); for (b) clear decision tree on organogenesis choice based on explant type and objective; for (c) energy plantation establishment: site selection → nursery raising → plantation → coppice management → harvest cycleStages mentioned but sequence unclear or timeframes missing; conflates rooting with acclimatization; organogenesis comparison lacks decision criteriaRandom listing without process logic; no temporal framework; confused cause-effect in problem-solution pairing
Application / ecology20%10Integrated analysis: (a) commercial micropropagation industry value (₹500 crore+), export potential of tissue-cultured plants; (b) organogenesis choice for conservation (direct for rare orchids) vs crop improvement (indirect for mutagenesis); (c) energy plantation ecological services: phytoremediation (Jatropha on heavy metal soils), carbon sequestration (2.5-5 t C/ha/year), watershed protection; policy coherence with India's NDCs and net-zero 2070 targetMentions applications superficially; lists benefits without ecological analysis; weak policy linkageNo application context; purely theoretical treatment; ignores energy security dimension entirely; no environmental considerations

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