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Q.
Which of the following unicellular organisms has a macronucleus for trophic function and one or more micronuclei for reproduction?
AIPMTAIPMT 2005Animal Kingdom
Solution:
Paramecium is a heterokaryotic organism i. e., it has two nuclei near the cytostome (oral shaped opening called mouth). The macronucleus, which is a conspicuous larger ellipsoidal vegetative nucleus, divides amitotically and controls the vegetative characters and micronucleus is a small compact reproductive nucleus which divides mitotically and controls the reproduction.