Question

which organelle is indicated as 1 in this paramecium figure?
micronucleus
macronucleus
contractile vacuole
central vacuole
cilia

Explanation:

Paramcium has contractile vacuoles that help in osmoregulation. The star - shaped structure (organelle 1) is characteristic of a contractile vacuole. Micronucleus (4) and Macronucleus (3) are nucleus - like structures. Central vacuole is not a feature of Paramecium (plant cells have central vacuoles). Cilia are hair - like structures on the cell surface for locomotion.

Answer:

Contractile Vacuole