The correct answer is by genus and species in the family Dioscoreaceae because botanical classification uses taxonomy to group plants by their evolutionary relationships. True yams belong to the family Dioscoreaceae, and the main yam genus is Dioscorea. Individual yams are then identified by species names such as Dioscorea rotundata or Dioscorea alata.

Other features like color, shape, origin, or cooking method may be useful for describing or comparing yams, but they are not the primary scientific classification system. When a question asks how yams are classified botanically, the correct answer must refer to the taxonomic framework of family, genus, and species. That is why answer A is correct.

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The correct answer is characteristics such as maturity period, tuber shape, and culinary properties because traditional West African yam classification is based on practical farming and food-use experience. Farmers need to know when a variety matures, what the tuber looks like, and how it behaves in cooking, so these traits naturally became part of local classification systems.

This approach is different from modern laboratory-based taxonomy, but it is not random or simplistic. It reflects generations of careful observation and agricultural knowledge. Leaf shape alone would not be enough, and DNA analysis belongs to modern science rather than traditional farmer classification. That is why answer C best describes the West African system.

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The correct answer is DNA sequencing results because farmers usually classify yam varieties using traits they can observe directly, such as tuber characteristics, growth habit, maturity, and cooking quality. These are practical features that matter in cultivation and food use. DNA sequencing, by contrast, is a modern laboratory method used mainly by researchers.

Farmer knowledge and scientific analysis can complement each other, but they are not the same kind of classification system. The question asks which basis is not commonly used by farmers, and the answer is the one that depends on molecular tools rather than field observation. That makes DNA sequencing results the correct choice.

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The correct answer is molecular genetic analysis because this is the modern scientific method used to verify and study traditional yam classification systems. By examining DNA and genetic markers, researchers can compare yam varieties more deeply than by appearance alone and see whether local classifications match underlying biological relationships.

Visual inspection, taste tests, and growth measurements can still be useful, but they do not provide the same level of evidence about genetic relatedness. Molecular analysis helps connect traditional farmer knowledge with modern plant science. That is why the best answer for a modern verification method is molecular genetic analysis.

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The correct answer is IPGRI/Bioversity International because this organization developed international descriptor standards for plant genetic resources, including yams. Standardized descriptors are important in germplasm classification because they let genebanks and researchers in different places record and compare varieties in a consistent way.

IPGRI, the International Plant Genetic Resources Institute, later became Bioversity International, so both names are associated with this standards work. The other choices are not recognized organizations for yam germplasm classification. Because the question asks about international standards for yam genetic-resource classification, IPGRI/Bioversity International is the correct answer.

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The correct answer is by a combination of species, agronomic traits, and local names because cultivated yam classification in agriculture must serve both science and practice. Species identity provides the botanical foundation, while agronomic traits such as maturity period, tuber shape, yield behavior, or disease response help distinguish useful varieties in the field. Local names also matter because they are how farmers and communities actually recognize and discuss these yams.

The other options are too limited. Species alone does not capture cultivar differences, continent of origin is not enough for farm use, and harvest date by itself is far too narrow. Agricultural systems usually classify yam varieties with a mixed approach that combines taxonomy, field traits, and local naming.

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The correct answer is that similar varieties may have different local names in different regions. This is a common problem with traditional yam landraces because naming systems are local and culturally rooted. As varieties are exchanged or preserved in different communities, the names used for them can change even when the yams are very similar.

This creates challenges for classification, conservation, and germplasm documentation. Researchers may need to determine whether two differently named landraces are actually the same or closely related. The other choices are unrealistic, but regional naming differences are a very real issue. That is why answer B is correct.

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The correct answer is ethno-botanical classification because it combines traditional farmer or community knowledge with scientific plant analysis. Ethnobotany focuses on how people name, use, and understand plants, then connects that knowledge to formal botanical study. This makes it especially valuable for yams, which often have rich local classifications and cultural significance.

The other choices are incomplete or meaningless in this context. Pure molecular analysis leaves out traditional knowledge, and random or computer-only classification does not describe a real integrated system. Because the question asks for an approach that joins local understanding with science, ethno-botanical classification is the best answer.

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The correct answer is accession numbers linked to passport data because germplasm banks need a reliable way to track each yam genetic resource sample. An accession number serves as the unique identifier for a sample, while passport data records essential background information such as origin, collection location, local name, and taxonomic identity. Together, they create a complete record.

This system is crucial for conservation, research, and sharing plant material. A random number without supporting data would not be enough, and alphabetical or weight-based systems would not preserve the necessary scientific context. Because genebanks depend on traceable, well-documented records, accession numbers linked to passport data are the standard and correct answer.

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