Ans: Ciliates have two nuclei namely micronucleus and macronucleus. Both of them are vital for ciliate. Ciliates’ requirement for energy is very high and so they need a nucleus dedicated solely to control their metabolism and macronucleus is responsible for this function. Macronucleus also has genes that have the role of regulating cell functions. The other one is a smaller nucleus called micronucleus which is essential for reproduction.