(a) What is allopolyploidy? Describe its applications and limitations in crops. (20 marks)

(b) Discuss the involvement of public and private sectors in production and marketing of seeds. (20 marks)

(c) Give an account of bulk method of breeding. Di

Question

(a) What is allopolyploidy? Describe its applications and limitations in crops. (20 marks)

(b) Discuss the involvement of public and private sectors in production and marketing of seeds. (20 marks)

(c) Give an account of bulk method of breeding. Discuss its merits and demerits. (10 marks)

UPSC Answer Check · Accepted Answer

The directive 'describe' in part (a) demands detailed exposition with examples, while 'discuss' in (b) and 'give an account' in (c) require analytical and narrative treatment respectively. Allocate approximately 40% of time/words to part (a) given its 20 marks and conceptual depth, 40% to part (b) for its policy complexity, and 20% to part (c). Structure: brief introduction defining key terms, then three dedicated sections for each sub-part with clear sub-headings, ending with a synthesis on integrated crop improvement and seed security.
- For (a): Definition of allopolyploidy (hybridization between species followed by chromosome doubling); distinction from autopolyploidy; mechanism via colchicine treatment or spontaneous doubling
- For (a): Applications—creation of synthetic amphidiploids (e.g., Triticale from wheat × rye), bridge species for gene transfer, restoration of fertility in wide crosses; limitations—sterility in F1, genetic instability, reduced fertility, longer breeding cycles
- For (b): Public sector dominance in foundation and breeder seed (ICAR, SAUs, NSC, SFCs); private sector ascendancy in hybrids (cotton, maize, vegetables) and proprietary GM traits; marketing channels—dealer networks, e-commerce, direct marketing
- For (b): Policy interface—Seed Act 1966, PPV&FR Act 2001, Seed Bill 2004 (pending); issues of farmer vs. corporate rights, seed sovereignty, price control vs. innovation incentive
- For (c): Bulk method procedure—F2 to F6 grown in bulk mass, natural/artificial selection pressure, individual plant selection in F6-F7, yield testing in F8 onwards; comparison with pedigree and SSD methods
- For (c): Merits—simpler, less labour, effective for high heritability traits, maintains large population; demerits—no record of ancestry, risk of losing desirable genotypes, slower for low heritability traits, requires large land area

Dimension	Weight	Max marks	Excellent	Average	Poor
Concept correctness	25%	12.5	Precisely defines allopolyploidy with correct cytogenetic mechanism (2n1 + 2n2 = 4n); accurately distinguishes amphidiploid vs. segmental allopolyploid; correctly identifies bulk method stages and selection timing; no confusion between F1 sterility and allopolyploid fertility restoration	Basic definition correct but conflates auto- and allopolyploidy; describes bulk method steps but misplaces selection generation; minor errors in chromosome numbers or generation advancement	Fundamental confusion between polyploidy types; describes pedigree method instead of bulk; incorrect generation notation (e.g., selecting in F2); serious cytogenetic errors
Quantitative reasoning	15%	7.5	Cites specific ploidy levels (e.g., Triticale 2n=56 from 2n=42 wheat + 2n=14 rye); mentions population sizes in bulk method (10,000-50,000 plants); quantifies seed sector shares (public:private ratio ~30:70 in hybrids); references heritability thresholds for bulk method effectiveness	General awareness of chromosome doubling but no specific numbers; vague population references; mentions hybrid seed market growth without statistics	No quantitative data; incorrect ploidy calculations; confuses percentages with absolute numbers; ignores generation numbers entirely
Indian context examples	20%	10	Cites Indian allopolyploid: Triticale varieties (e.g., TL-1 to TL-3 from IARI); Indian bulk method application in wheat/rice improvement (e.g., Kalyan Sona background); names specific public institutions (IARI, DWR Karnal) and private players (Mahyco, Nuziveedu); references Seed Village Programme or PM-KISAN link to seed access	Mentions wheat and rice breeding without specific varieties; general reference to NSC and private companies; no specific Indian policies named	Only foreign examples (Raphanobrassica, American Triticale); no Indian institutional knowledge; treats seed sector as generic without national specificity
Diagram / process	20%	10	Clear schematic of allopolyploidy formation (species A × species B → sterile F1 → colchicine → fertile amphidiploid); flowchart of bulk method generations with selection points; structured comparison table for public-private seed sector functions; generation advancement table showing F2 through F8	Describes processes verbally without visual structure; mentions colchicine mechanism but no diagram reference; lists seed sector roles without comparative framework	No process description; confuses bulk with pedigree method diagrammatically; no generational sequence; missing cytogenetic steps
Policy / extension angle	20%	10	Critically examines PPV&FR Act's impact on allopolyploid research (benefit sharing); analyzes Seed Bill 2004 provisions on GM seed regulation and farmer rights; discusses bulk method's relevance for resource-poor farmers and participatory breeding; evaluates public-private partnership models (e.g., IARI-private hybrid development)	Mentions Seed Act and PPV&FR Act without critical analysis; notes farmer-saved seed issue superficially; generic comment on technology transfer	No policy references; ignores IPR issues in allopolyploidy; no extension relevance; treats breeding methods as purely technical without institutional embedding

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