Question

i) Define diffusion and osmosis. Which of these happen in the following cases?
a) Aquatic organisms using oxygen dissolved in water during respiration
b) Swelling up of deshelled egg on keeping in water

Answer 1

Answer:i).Diffusion: Diffusion is the movement of particles from an area of higher concentration to lower concentration.

Osmosis: Osmosis is the movement of solvent particles across a semipermeable membrane from a dilute solution into a concentrated solution.

a)It is essential for the survival of fish and other aquatic organisms. Oxygen dissolves in surface water due to the aerating action of winds. Oxygen is also introduced into the water as a byproduct of aquatic plant photosynthesis. When dissolved oxygen becomes too low, fish and other aquatic organisms cannot survive.

b)The egg that was soaked in water appears swollen because of osmosis too. This egg has less water concentration than that of the water. So, to equalize the concentration, the water molecules moved into the egg instead of moving out of it.

Explanation:

Answer 2

Answer:

Diffusion _ The process by which the molecules of a substance move from the area of higher concentration to the area of lower concentration through direct contact

Osmosis_ The movement of water molecules from the area of higher concentration to the area of lower concentration through semi permeable membrane

[b] swelling up of deshelled egg on keeping in water