2021 WAEC Biology Theory (a) Complete the table below by placing each of the following organisms under the appropriate...

WAEC 2021

(a) Complete the table below by placing each of the following organisms under the appropriate heading: Algae, Bacteria, Dog, Water lettuce, Tadpole, Cat, Lemna, Waterleaf, Mucor, Mushroom

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(b)(i) Name four products of decomposition (ii) Mention three roles of decomposers on a refuse dump
(c) List three materials found in a refuse dump which would not be affected by the action of decomposers.

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Explanation

(a)

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(b)(i) Products of Decomposition: Hydrogen sulphide;-Carbon(IV) oxide; -Methane; -Ammonia; -Water vapour/water;-Mineral salt/plant nutrients;-Heat/energy;-Humus.
(ii) Roles of Decomposer on Refuse Dump:-They feed on dead/decaying organisms, -They form a link in a food chain; -They form a link between biotic and abiotic factors in ecosystem; materials; -They release inorganic components from organic materials; - they facilitate the recycling of nutrients in the ecosystem; -They reduce the bulky nature of the debris/dump.
(c) Materials in a Refuse Dump that would not be Affected by the Action of Decomposers: -Plastics; -Metals/iron/tin/zinc/aluminium; -Glass/bottle -Nylon/polyethene; -Rubber/tyres,-Stones; Ceramics.