Question

Which of the following is not a unicellular organism ?
A. Amoeba
B. Yak
C. Yeast
D. Rhizobium

Answer 1

Yak is not a unicellular organism.
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Answer 2

B. Yak

Explanation:

Amoeba, Yeast and Rhizobium are unicellular organisms. Animals like Yak are multi-cellular organisms.

A unicellular organism is an organism that consists of a single cell. This means all life processes, such as reproduction, feeding, digestion, and excretion, occur in one cell. Amoebas, bacteria, and plankton are just some types of unicellular organisms.

Multicellular organisms are those composed by multiple cells. They are classified in 13 major groups of terrestrial living beings, including animals, plants, fungi, ciliates, algae, and foraminifera.  

Option B is the answer.