Which of the following unicellular organism has a macronucleus for...

Paramecia have two kinds of nuclei: a small nucleus germinal nucleus also known as the micronucleus is involved in sexual processes. large ellipsoidal somatic nucleus, also known as the macro-nucleus participates in the process of transcription and ensures the expression of genetic information needed for the everyday functioning of the cell.
Related Theory Paramecium belongs to the phylum Ciliophora. Its whole body is covered with small hair-like filaments called cilia which are in constant motion and help it move with a speed that is four times its body's length per second. Just as the organism moves forward, rotating around its own axis, this further helps it to push the food into the gullet. By reversing the motion of cilia, paramecium can move in the reverse direction.