EVERYDAY SCIENCE

Detailed explanation-1: -The ‘cell membrane’ (also known as the plasma membrane or cytoplasmic membrane) is a biological membrane that separates the interior of all cells from the outside environment. The cell membrane is selectively permeable to ions and organic molecules and controls the movement of substances in and out of cells.

Detailed explanation-2: -Answer and Explanation: The cellular plasma membrane, which encloses the cell, regulates the movement of substances in and out of the cell. The plasma membrane, being semi-permeable, permits the entry of certain substances, and restricts others.

Detailed explanation-3: -A membrane is a selective barrier; it allows some things to pass through but stops others. Such things may be molecules, ions, or other small particles. Membranes can be generally classified into synthetic membranes and biological membranes.

Detailed explanation-4: -The cell membrane is a very thin layer of protein and fat. It allows only selective substances to pass through it, hence, it is called a selectively permeable membrane.

Detailed explanation-5: -The membrane’s lipid bilayer structure provides the first level of control. The phospholipids are tightly packed together, and the membrane has a hydrophobic interior. This structure causes the membrane to be selectively permeable.