Select wrong statement for protozoans.
(i) All protozoans are heterotrophs and live as predators or parasites.
(ii) They are believed to be primitive relatives of animals.
(iii) Marine forms of amoeboid protozoans have silica shells on their surface.
(iv) Sporozoans move and capture their prey by putting out pseudopodia.
(v) Flagellated protozoans are either free-living or parasitic.
(vi) In flagellated protozoans coordinated movement of rows of cilia causes the water laden with food to be steered into the gullet.
Text Solution
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Statement (iv) is wrong because sporozoans (like Plasmodium) are non-motile parasites that lack locomotory structures like pseudopodia. Pseudopodia are actually the characteristic locomotory and feeding structures of amoeboid protozoans.
Statement (vi) is wrong because it describes the movement and feeding mechanism of ciliated protozoans (like Paramecium), not flagellated protozoans. In ciliated protozoans, thousands of cilia move in a coordinated fashion to steer food-laden water into their gullet. Flagellated protozoans move using one or more flagella and do not have rows of cilia or a gullet-based feeding system like this.
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