Practice question

Plant introduction represents deliberate movement and establishment of genotypes, cultivars, species or wild relatives into new geographic area where they were not previously cultivated, either internationally or domestically. Procedure encompasses exploration, procurement via correspondence with genebanks such as CIMMYT, IRRI, USDA, quarantine screening for pathogens, cataloging with exotic collection EC or indigenous IC numbers, multi-location evaluation for photoperiod and temperature adaptation, and eventual acclimatization through natural selection shifting allele frequencies. Two categories are recognized: primary introduction where introduced cultivar directly used as commercial variety after selection, exemplified by IR8 rice, and secondary introduction where introduced germplasm serves as donor parent in hybridization for introgression of specific traits like disease resistance encoded by R genes. This method enriches narrow genetic base and complies with ITPGRFA exchange protocols. This understanding supports competitive exam preparation for NEET, GATE and CSIR NET concepts linking genotype with phenotype through molecular pathways involving transcription factors, hormones and metabolic enzymes that regulate development, adaptation and reproductive biology in applied breeding programs.