• Official Question Status: This question was DROPPED by NTA / ICAR in the final official answer key, and full marks were awarded to all candidates.
• Plant Germplasm Introduction in India:
• NBPGR (National Bureau of Plant Genetic Resources, New Delhi): The nodal national organization vested with regulatory and quarantine authority for germplasm introduction and exchange of agricultural and horticultural plants.
• BSI (Botanical Survey of India, Kolkata): Involved in wild plant exploration, documentation, and exotic introduction into botanical gardens.
• NBRI (National Botanical Research Institute, Lucknow): CSIR institute with major introductions of ornamental germplasm.
• IIT Mandi has no constitutional mandate for plant germplasm introductions.

• Growth Habits in Orchidaceae:
• Epiphytic Orchids: Grow non-parasitically perched on the bark/branches of trees, absorbing moisture and nutrients from humid air and debris via aerial roots clad in velamen tissue.
• Sympodial Growth Pattern: Possess a creeping rhizome that produces specialized swollen water-storage pseudobulbs each growing season terminating in an inflorescence, with subsequent growth continuing from lateral axillary buds.
• Analysis of Genera:
• Cattleya: Tropical epiphytic orchid exhibiting quintessential sympodial pseudobulbs.
• Dendrobium: Diverse epiphytic genus exhibiting distinct sympodial cane-like pseudobulbs.
• (A) Aerides: Epiphytic but monopodial (single main stem growing continuously from apical meristem).
• (D) Spathoglottis: Ground-dwelling terrestrial orchid.
• Correct Option: Option 2 ((B) and (C) only).

• Logical Sequence in Marker-Assisted Breeding (MAB):

• (F) Selection of divergent parents: Identifying genetically and morphologically contrasting parental lines for target traits.
• Development of breeding populations like $F_2$ progeny: Hybridizing selected parents and selfing $F_1$ to generate segregating $F_2$ populations.
• DNA isolation and purification: Extracting high-quality genomic DNA from parents and segregating progenies.
• Polymerase chain reaction and gel electrophoresis: Amplifying polymorphic DNA sequences with primers and separating amplicon bands.
• Scoring for markers for determination of polymorphism: Genotyping allelic banding patterns across individuals.
  6. (A) Correlation of molecular markers with morphological traits: Conducting linkage and QTL mapping to associate molecular markers with target phenotypes.
  • Correct Sequence: (F), (D), (E), (C), (B) and (A), matching Option 3.

• Dicliny (Unisexuality) $\rightarrow$ (II) Monoecy and Dioecy: Flowers are structurally unisexual (either staminate or pistillate), occurring on the same plant (monoecy) or separate plants (dioecy).
• Dichogamy $\rightarrow$ (I) Protogyny and Protandry: Temporal separation in sexual maturation; anthers shed pollen before stigmas become receptive (protandry) or stigmas mature first (protogyny).
• Self-incompatibility $\rightarrow$ (IV) Sporophytic and Gametophytic: Physiological barrier preventing self-fertilization, genetically governed by the $S$-phenotype of pollen parent (sporophytic SI) or pollen grain genotype (gametophytic SI).
• Male Sterility $\rightarrow$ (III) Genetic, Cytoplasmic, Cytoplasmic Genetic: Non-functional pollen controlled by nuclear genes (GMS), mitochondrial genes (CMS), or nuclear-cytoplasmic restoration systems (CGMS).
• Correct Combination: (A)-(II), (B)-(I), (C)-(IV), (D)-(III), matching Option 4.

Correct option: (4) -(A)- (I), (BY (1), (CH(IV), (D)-(1ID)