Question

What is a cyclosis?

• A. Circular movement of cytoplasm inside the cell
• B. Up and down movement of protoplasm
• C. To and fro movement of nucleoplasm
• D. None of the above

Answer 1

The correct option is A Circular movement of cytoplasm inside the cell

The streaming movement of the cytoplasm inside the cell is known as cyclosis. It is also known as protoplasmic streaming, a circular movement. It helps in the intracellular transport of proteins, water and oxygen. It was first discovered in 1830. Cyclosis mainly takes place due to the interaction of two motor proteins known as actin and myosin. Actin filaments are aligned in rows parallel to the streaming just inside the cell membrane. Myosin molecules attached to cellular organelles move along the actin fibres, towing the organelles and sweeping other cytoplasmic contents in the same direction.

So, the correct answer is option A.