IT’S A GREEN WORLD Transport in plants

Starter What weather conditions make a good drying day?

Transport in plants Learning objectives Success criteria Describe and explain the factors that affect the transpiration rate. Understand how some species are adapted to reduce water loss by transpiration. Students should understand : the effects of different conditions on the rate of transpiration be able to describe how this can be measured in experiments relate plant structure to environmental conditions

Transpiration Water moving through a plant is a bit like the way you drink liquid through a straw. It is ‘sucked’ up from the top, with liquid being replaced at the bottom. A plants environment affects the rate of transpiration: light intensity Students to take notes temperature air movement (wind). humidity (amount of moisture in the air)

Why does transpiration rate vary? Students to take notes For each slide note down how these factors affect the rate of transpiration.

Complete worksheet B4c5 -Plants and their locations Task Complete worksheet B4c5 -Plants and their locations Leaf A is a normal leaf. Leaf B is a grass leaf because it has stomata on both surfaces; there are no upper and lower surfaces in a leaf that grows vertically. Leaf C is a water lily leaf because it has stomata on the upper surface; if they were in the lower surface the leaf would become water logged and unable to transpire. Leaf D is a cactus leaf because it is shaped as a spine and has few stomata to reduce water loss. Leaf E is a heather leaf because it has sunken stomata to reduce water loss. Leaf F is a Marram grass leaf because it has special adaptations to reduce water loss, i.e. curled leaves, hairs to trap moisture.

Plenary

Transport in plants Learning objectives Success criteria Describe and explain the factors that affect the transpiration rate. Understand how some species are adapted to reduce water loss by transpiration. Students should understand : the effects of different conditions on the rate of transpiration be able to describe how this can be measured in experiments relate plant structure to environmental conditions