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FBISE Biology
Answer: Species is the smallest taxon in the taxonomic hierarchy.
Answer: A genus is a group of closely related species, e.g., Panthera contains the lion and the tiger.
Answer: A family is a group of related genera.
Answer: In plants the rank 'phylum' is called 'division'.
Answer: Lion and tiger are different species but share the same genus Panthera.
Answer: Classification arranges organisms into groups, making their study systematic and organized.
Answer: Since millions of organisms exist, classification groups them so that they can be studied conveniently.
Answer: A species is a group of organisms that can interbreed freely and produce fertile offspring.
Answer: Organisms that cannot interbreed to produce fertile offspring belong to different species.
Answer: The biological species concept defines species on the ability to interbreed, so reproductive isolation separates different species.
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Answer: Viruses cannot live or reproduce outside a host; they are obligate intracellular parasites.
Answer: A virus consists of a nucleic acid core (DNA or RNA) surrounded by a protein coat.
Answer: Viroids are the smallest known infectious agents, made only of naked RNA.
Answer: Unlike viruses, viroids consist only of RNA and lack a protein coat.
Answer: Prions are infectious protein particles with no nucleic acid.
Answer: Prions cause BSE (mad cow disease) in cattle and Kuru in humans.
Answer: Viruses multiply only inside living host cells because they lack their own machinery.
Answer: Taxonomy is the branch of biology concerned with naming and classifying organisms.
Answer: Carolus Linnaeus is called the father of taxonomy for introducing binomial nomenclature.
Answer: Phylogenetic classification groups organisms on the basis of their evolutionary relationships.