Diversity in Living Organisms

Flukes are flat worms constituting the class Trematoda.

Flame cells are ciliated structures mainly concerned with excretion in flatworms.

Multicellular animals which show active movements through their environments are characterised by the presence of bilateral symmetry.

This option is correct because amoeba was discovered by Sir Ronald Ross, and not by R. V. Rosenhof.

Stichonematic flagella bear a single row of mastigonemes alongside the sheath, e.g. Euglena.

Trichonympha are symbiotic flagellate found in the gut of termites and cockroaches.

This option is correct because the locomotory organs are absent in class Sporozoa.

This option is correct because Amoeba proteus is ammonotelic in nature.

This option is correct because Ceratium and Noctiluca show bioluminescence.

Correct answer. Balantidium, Giardia, Trypanosoma: All are internal parasite protozoa. Balantidium is a common intestinal parasite of vertebrates, found chiefly in amphibians and mammals. Giardia are found as parasites in the digestive tract of vertebrates. Trypanosoma are the endoparasites which reside in blood and cerebrospinal fluid of man.

This option is correct because amoeba shows positive behaviour towards darkness.

This is the correct answer as this statement is incorrect. Onion peel cell is a eukaryotic cell.

This is the correct answer as a spirogyra is a multicellular organism that is also a plant-like protist.

Holozoic nutrition involves ingestion of solid organic food, like Amoeba engulfing food particles via phagocytosis. Amoeba cannot make its own food (not autotrophic). While it is heterotrophic (obtains food from external sources), 'holozoic' more specifically describes its mode of ingesting particulate matter.

Animals like lizard, fish and snakes have scales on their bodies. These scales are hard and protect them from other animals.