Explaining the Effects of Temperature, Wind Speed & Humidity (Cambridge (CIE) IGCSE Biology)

Explaining the Effects of Temperature, Wind Speed & Humidity: Extended

Extended Tier Only

• Wind speed, humidity and temperature all have an effect on the rate at which transpiration occurs

• The table below explains how these factors affect the rate of transpiration when they are all high; the opposite effect would be observed if they were low

Transpiration Rate Factors Table

• A potometer can be used to investigate the effect of environmental factors on the rate of transpiration

Wilting: Extended

Extended Tier Only

• If more water evaporates from the leaves of a plant than is available in the soil to move into the root by osmosis, then wilting will occur

• This is when all the cells of the plant are not full of water, so the strength of the cell walls cannot support the plant and it starts to collapse

A wilted plant cannot support itself and starts to collaps