The streaming movement of cytoplasm within the Paramecium is known as

Step 1: Analyze the question The question asks for the term describing the streaming (flowing) movement of cytoplasm inside a cell such as Paramecium.

Step 2: Explain the concept Cytoplasm in many cells is not still. It flows in a regular, circular pattern that helps distribute nutrients, food vacuoles, and other materials around the cell. This movement is called cyclosis (also called cytoplasmic streaming). In Paramecium, food vacuoles are carried around the cell by this movement as digestion proceeds.

Step 3: Check each option

• A. Transpiration is the loss of water vapour from plant leaves through the stomata. It has nothing to do with cytoplasm in a protozoan.
• B. Digestion is the breakdown of complex food into simple soluble molecules. It is a chemical process, not a movement of cytoplasm.
• C. Cyclosis is the streaming movement of cytoplasm within a cell. This matches the question.
• D. Osmosis is the movement of water across a semi-permeable membrane from a region of high water potential to one of low water potential. It is not cytoplasmic streaming.

Step 4: Answer The correct option is C. Cyclosis.

Tip: Link "cyclosis" with "cycle". The cytoplasm moves round and round in a cycle. Don't confuse it with osmosis, which always involves water crossing a membrane.