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What is common about Trypanosoma, Noctiluca, Monocystis and Giardia -
A
These are all unicellular protists
B
They have flagella
C
They produce spores
D
These are all parasites
Detailed Solution
Trypanosoma is a flagellated protozoan that causes sleeping sickness.
Noctiluca is a marine dinoflagellate known for bioluminescence; it is free-living.
Monocystis is a sporozoan that lives as a parasite in the seminal vesicles of the earthworm; it has no flagella in the adult stage.
Giardia is a flagellated protozoan that is parasitic in the human intestine.
Noctiluca is not a parasite, so they are not all parasites; Monocystis has no flagella, so they do not all have flagella; and only Monocystis is a typical spore producer.
All four are single-celled eukaryotes and belong to the kingdom Protista.
So what is common is that these are all unicellular protists.
Noctiluca is a marine dinoflagellate known for bioluminescence; it is free-living.
Monocystis is a sporozoan that lives as a parasite in the seminal vesicles of the earthworm; it has no flagella in the adult stage.
Giardia is a flagellated protozoan that is parasitic in the human intestine.
Noctiluca is not a parasite, so they are not all parasites; Monocystis has no flagella, so they do not all have flagella; and only Monocystis is a typical spore producer.
All four are single-celled eukaryotes and belong to the kingdom Protista.
So what is common is that these are all unicellular protists.