Osmosis

Question 1

Osmosis definition

Answer 1

The diffusion/movement of water molecules through a selectively permeable membrane from a dilute solution to a more concentrated solution

Question 2

Lysis

Answer 2

The effect of water moving into an animal cell causing the vacuole inside to expand and the membrane to stretch until it splits and the cell bursts

Question 3

How does a plant gain support

Answer 3

When water enters a cell the vacuole increases in size pushing the cell membrane against the cell wall. The force of the membrane pushing against the stiff cell wall increases the pressure inside the cell making it firm or turgid

Question 4

Plasmolysis

Answer 4

When a plant cell loses too much water by osmosis. So much water leaves the plant that the cell’s content shrinks pulling the cell membrane away from the cell wall

Question 5

Transpiration definition

Answer 5

The loss of water by evaporation

Question 6

Uses of water in a plant

Answer 6

Growth

Photosynthesis

Support

Transpiration

Question 7

Measuring water uptake using a potometer

Answer 7

A bubble potometer is used to measure water uptake in a leafy shoot. As water evaporates from the leaves of the cut shoot, the shoot sucks up water through the potometer. The distance an air bubble moves in a period of time can be used to calculate the rate of water uptake

Question 8

Conditions that increase the rate of evaporation, transpiration and water uptake

Answer 8

Higher temperatures or higher wind speed

Question 9

Conditions that decrease the rate of evaporation, transpiration and water uptake

Answer 9

Higher levels of humidity