Question

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4) WHAT DO WE UNDERSTAND BY THE WORD
a) DIFFUSION
b) SEMI - PERMEABLE MEMBRANE
c) CELL WALL
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Answer 1

Answer:

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• a) a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one.

• b) Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
• c) A cell wall is a structural layer surrounding some types of cells, just outside the cell membrane. It can be tough, flexible, and sometimes rigid. It provides the cell with both structural support and protection, and also acts as a filtering mechanism.

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Answer 2

Answer:

Diffusion

Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region in which they are in higher concentration to regions of lower concentration.

• It continues until the concentration of substances is uniform throughout.

Three common types of passive transport include

• simple diffusion,
• osmosis, and
• facilitated diffusion.

Simple Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration.

SEMI - PERMEABLE MEMBRANE

Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion

• occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.

Cell Wall

The cell wall is the protective, semi-permeable outer layer of a plant cell.

• A major function of the cell wall is to give the cell strength and structure, and to filter molecules that pass in and out of the cell.