Question

How do substances like CO₂ and water move in and out of the cell? Discuss.

Answer 1

Movement of CO₂:

1. Substances like CO₂ and oxygen move in and out of the cell through the plasma membrane by diffusion.
2. When the concentration of CO₂ is low outside the cell, CO₂ moves out of the cell by diffusion and vice versa.

Movement of water:

1. Movement of water is affected by the amount of substance dissolved in water.
2. Water moves from a region of high water to a region of low water concentration by osmosis.
3. Osmosis is the process in which solvent molecules pass through a semi-permeable membrane from an area of higher concentration to an area of lower concentration.