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Which of the following unicellular organisms has a macronucleus for trophic function and one or more micronuclei for reproduction -
A
Trypanosoma
B
Paramecium
C
Euglena
D
Amoeba
Detailed Solution
Paramecium is a ciliated protozoan that shows nuclear dimorphism: it has two kinds of nuclei.
The large, polyploid macronucleus controls the vegetative (trophic) functions such as metabolism, growth and the synthesis of proteins.
One or more small, diploid micronuclei take part in reproduction, especially in conjugation (sexual process), and give rise to the new macronucleus.
Trypanosoma, Euglena and Amoeba have only one kind of nucleus.
So the organism is Paramecium.
The large, polyploid macronucleus controls the vegetative (trophic) functions such as metabolism, growth and the synthesis of proteins.
One or more small, diploid micronuclei take part in reproduction, especially in conjugation (sexual process), and give rise to the new macronucleus.
Trypanosoma, Euglena and Amoeba have only one kind of nucleus.
So the organism is Paramecium.