WAEC Biology 2023 Theory — Question 1
Question 1 of 12 from the West African Examinations Council (WAEC) Biology 2023 Theory paper, with the correct answer and a full explanation.
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[Essay Paper 2 — Section A] 1(a). What is classification of living things? 1(b). State four ways each by which the following groups of organisms are of economic importance in their habitats: (i) Fungi; (ii) plants. 1(c). Complete the table below by stating five major phyla of the Kingdom Animalia and given one example of each.
Model answer
Classification of living things is the grouping/arrangement of organisms, with similar characteristics based on structural/genetic/cellular/evolutionary trends, for easy identification. (b)(i) Fungi are of economic importance because they: cause various plant/animal diseases; act as decomposers; recycle nutrients; bring about fermentation in breweries; are used in baking industries. (ii) Plants are of economic importance because they: are involved in nutrient recycling; purify the environment/reduce greenhouse effects; provide shade/shelter; provide food; provide oxygen. (c) Major phyla of the Kingdom Animalia and examples: Porifera — Sponges/Venus flower basket Cnidaria/Coelenterata — Hydra/Obelia/sea anemone/jellyfish/Aurelia/coral Platyhelminthes — Liver fluke/tapeworm/Schistosoma/planaria Nematoda — Wuchereria/whipworm/Ascaris/Guinea worm/hookworm Annelida — Marine worm/leech/earthworm/lugworm/seaworm/bobbit worm/fireworm Mollusca — Snail/bivalve/slug/octopus/clam/oyster/squid Arthropoda — Scorpion/spider/cockroach/crab/crayfish/grasshopper/centipede/millipede/ant Echinodermata — Starfish/sea lily/sea cucumber/brittle star/sea star Chordata — Fish/frog/toad/bird/man/human/cat/lion/tiger/dog/salamander/alligator/snake/giraffe
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