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What is common about Trypanosoma, Noctiluca, Monocystis and Giardia?

  • These are all unicellular protists

  • They have flagella

  • They produce spores

  • These are all parasites

Answer

A.

These are all unicellular protists

Trypanosoma, Noctiluca, Monocystis and Giardia are all unicellular protists.
Trypanosoma gambiense is the single celled, parasitic zooflagellate causing trypanosomiasis or sleeping sickness.
Giardia or the 'Grand old man of the intestine' is a diplomonadid parasitic flagellate occurring in the intestine of man and other animals and causes giardiasis or diarrhoea (i.e., very loose and frequent stool containing large quantity of fat).
Noctiluca is a marine, colourless dinoflagellate. It is a voracious predator and has a long, motile tentacle, near the base of which, its single short flagellum emerges.
Monocystis is a microscopic, unicellular endoparasitic protoan found in the coelom and seminal vesicles of earthworm. As it is an endoparasite, it does not possess any special structure for locomotion.

Trypanosoma, Noctiluca, Monocystis and Giardia are all unicellular protists.
Trypanosoma gambiense is the single celled, parasitic zooflagellate causing trypanosomiasis or sleeping sickness.
Giardia or the 'Grand old man of the intestine' is a diplomonadid parasitic flagellate occurring in the intestine of man and other animals and causes giardiasis or diarrhoea (i.e., very loose and frequent stool containing large quantity of fat).
Noctiluca is a marine, colourless dinoflagellate. It is a voracious predator and has a long, motile tentacle, near the base of which, its single short flagellum emerges.
Monocystis is a microscopic, unicellular endoparasitic protoan found in the coelom and seminal vesicles of earthworm. As it is an endoparasite, it does not possess any special structure for locomotion.