Question

Which of the following unicellular organism has a macronucleus for trophic function and one or more
micro nuclei for reproduction?

• A. Euglena
• B. Amoeba
• C. Paramecium
• D. Trypanosoma

Answer 1

The correct option is C Paramecium

Paramecium is unicellular, free-living protozoa. It is completely covered with tiny hair-like projections called cilia which beat rhythmically to propel them. On the ventral surface, an oral groove runs diagonally posterior to the mouth and gullet. A thin layer of ectoplasm lies directly beneath the pellicle and encloses the endoplasm. The endoplasm contains granules, food vacuoles, and contractile vacuoles. Paramecia have two kinds of nuclei: a large ellipsoidal nucleus called a macronucleus and at least one small nucleus called a micronucleus. The macronucleus is the center of all metabolic activities of the organism. The micronucleus is a storage site for the germline genetic material of the organism. It gives rise to the macronucleus and is responsible for the genetic reorganization that occurs during conjugation.

Thus, the correct answer is option C.