Science Group
Explore subjects and practice MCQs
7
Chapters
1,610
Total MCQs
Science Group
741
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.
Answer: In situ conservation protects species in their natural habitats, e.g., national parks.
Answer: Ex situ conservation keeps organisms away from their natural habitat, e.g., zoos and botanical gardens.
Answer: National parks protect plants and animals in their natural surroundings, so it is in situ conservation.
Answer: National parks, wildlife sanctuaries and biosphere reserves are examples of in situ conservation.
Answer: A biodiversity hotspot has high species richness and many endemic species and is under serious threat.
Answer: An endangered species is at serious risk of becoming extinct if threats continue.
Answer: An extinct species is one that has completely disappeared from the Earth.
Answer: Habitat destruction is considered the greatest threat to biodiversity worldwide.
Answer: The IUCN Red List assesses and records the conservation status of species.
Answer: The IUCN (International Union for Conservation of Nature) publishes the Red List.