NEET BIOLOGY

Detailed explanation-1: -Permeable membranes allow molecules to flow through, whereas impermeable membranes prevent molecules from flowing through. The cell wall of plants is considered to be permeable since it allows many molecules to freely pass through. These molecules include water and important nutrients and ions for the plant cell.

Detailed explanation-2: -Just as the outer layer of your skin separates your body from its environment, the cell membrane (also known as the plasma membrane) separates the inner contents of a cell from its exterior environment. This cell membrane provides a protective barrier around the cell and regulates which materials can pass in or out.

Detailed explanation-3: -Only the smallest molecules like water, carbon dioxide, and oxygen can freely diffuse across cell membranes. Larger molecules or charged molecules often require an input of energy to be transported into the cell.

Detailed explanation-4: -This membrane not only surrounds the cellular organelles but also acts as a barrier between the internal and the external environment. A cell membrane that is selectively permeable acts as a boundary or fence of the cell. It allows the molecules to pass through active or passive transport.

Detailed explanation-5: -The cell membrane is semipermeable (or selectively permeable). It is made of a phospholipid bilayer, along with other various lipids, proteins, and carbohydrates.