Question

Cyclosis was studied for first time in

• A. Tendril of Cucurbita
• B. Stem cells of Hydrilla
• C. Rhizoids of Rhizophora
• D. Staminal hairs of Tradescantia

Answer 1

The correct option is D Staminal hairs of Tradescantia

Cytoplasm is differentiated into cytoplasmic matrix, cell organelles and cell inclusions. Cytoplasmic matrix or cytosol is jelly like semifluid that exists in both sol and gel states. Cytoplasmic matrix is differentiated into outer non- granulated part called as ectoplasm and inner granulated part called as endoplasm. Endoplasm is usually in perpetual motion called cyclosis or cytoplasmic streaming. Cyclosis can be of two types : Rotation type where cytoplasmic matrix continuously flows in one direction, eg., young cells of Hydrilla leaf or circulation type in which matrix flows in different directions in the same cells. It was first observed in cells of staminal hair of Tradescantia.

So, the correct answer is 'Staminal hair of Tradescantia'