Landscaping

• First Commercial $F_1$ Hybrid Ornamental:
• 'Prima Donna' was introduced in 1909 by the pioneering German seed company Ernst Benary (Erfurt, Germany).
• Belongs to Begonia semperflorens (syn. Begonia $\times$ semperflorens-cultorum, fibrous-rooted wax begonia).
• Marked a historic milestone as the world's first commercially bred $F_1$ hybrid bedding plant, celebrated for extraordinary uniformity, vigorous branching, and continuous floriferousness.
• Correct Option: Option 2 (Begonia semperflorens).

• Chronological Sequence in Flower Seed Production:

• Establishment of parental plant culture: Raising healthy, uniform nursery and establishing parent blocks at recommended isolation distances.
• Maintenance of genetic purity by removal of off-types: Systematic rouging at vegetative, pre-flowering, and flowering stages to eliminate rogues and variants.
• Pollination management: Introducing insect pollinators (honeybees) or conducting manual emasculation and crossing for $F_1$ hybrids.
• Identifying optimum harvesting stage: Monitoring physiological maturity to prevent seed shattering.
• Harvesting of seeds: Gathering mature pods/capsules/heads.
  6. (F) Cleaning and storage of seeds: Threshing, winnowing, drying to safe moisture ($6-8\%$), and storing under controlled temperature/humidity.
  • Correct Sequence: (D), (A), (E), (C), (B) and (F), matching Option 1.

• 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)