Question

Coenobium occurs in

• A. Spirogyra
• B. Ulothrix
• C. Volvox
• D. Chlorella

Answer 1

The correct option is C Volvox

Volvox thallus is a motile colony with definite shape and number of cells. This habit of thallus is called coenobium.The colony is hollow, spherical or oval in shape and the size of colony is about the size of a pin head. The number of cells in a colony is fixed. Depending upon the species of Volvox the cells can be 500-60,000. The central part of colony is mucilaginous and the cells are arranged in a single layer on periphery of the colony.

Hence the correct option is C.