Topic 1 Diffusion, Osmosis And Active Transport

Question 1

What is diffusion?

Answer 1

Diffusion is the movement of molecules from a high to low concentration down the concentration gradient.

Question 2

What is osmosis?

Answer 2

Osmosis is the movement of water molecules from a high to low water concentration, down the concentration gradient through a partially permeable membrane.

Question 3

What is active transport?

Answer 3

Active transport is the movement of molecules from a low to high concentration up the concentration gradient. This requires energy from respiration.

Question 4

What is transpiration?

Answer 4

Transpiration is the loss of water from plants by evaporation.

Question 5

What’s the function of the stomata?

Answer 5

The stomata is underneath the leaf to limit evaporation. This is surrounded by two guard cells which control the opening and closing which controls the diffusion of gas and water.

Question 6

What’s the function of the guard cells and where are the found?

Answer 6

Guard cells control the opening and closing of the cell. Guard cells are surrounding the stomata.