FBISE Class 9th (SSC-l)
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FBISE Class 9th (SSC-l)
Answer: The three domains are Archaea, Bacteria and Eukarya, which include all cellular life forms.
Answer: Thermophiles are archaebacteria that thrive in extremely hot environments such as hot springs.
Answer: The six kingdoms are Archaebacteria, Eubacteria, Protista, Fungi, Plantae and Animalia; Monera belongs to the older five-kingdom system.
Answer: Prokaryotes lack a membrane-bound nucleus, while eukaryotes have a true nucleus.
Answer: Plant cell walls are made of cellulose, which provides structural support.
Answer: Mushrooms, moulds and yeasts are placed in kingdom Fungi.
Answer: Fungi are saprophytic organisms that absorb nutrients from dead organic matter.
Answer: All green plants are placed in kingdom Plantae because they photosynthesize and have cellulose cell walls.
Answer: Fungal cell walls are made of chitin, not cellulose.
Answer: Taxonomic ranks are arranged from the most inclusive (Domain) to the least inclusive (Species).
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.