Mrs Abrey Lesson 5 transpiration


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  • Photo credit: © 2007 Jupiterimages Corporation
  • Teacher notes This four-stage animation uses close-up illustrations of the roots, stem and leaves to show what happens in the different part of a plant during transpiration. Suitable prompts include: Start: What is transpiration? Stage 1: How do root hair cells increase the diffusion of water? Stage 2: Which plant tissue transports water? Stage 3: Through what part of the leaf does water evaporats? Stage 4: What will happen to the water after it has evaporated into the air? See the ‘ Movement In and Out of Cells ’ presentation for more information about osmosis and concentration gradients.
  • Teacher notes This activity provides illustrated explanations about why certain environmental factors influence the rate of transpiration. It could be used to introduce the topic or for revision purposes.
  • Mrs Abrey Lesson 5 transpiration

    1. 1. Transpiration Lesson objectives• All will be able to describe transpiration• Most will be able to explain differences in transpiration speed• Some will suggest reasons why plants compromise between gas exchange and water loss
    2. 2. How do tall trees get enough water?Redwoods are the tallest species of tree inthe world - the tallest was 120 metres.How does a plant this size get waterfrom its roots to the branches at thetop?What experiment could show that watertravels up stems?
    3. 3. TranspirationTranspiration can be measured using a potometer. A cut plant stem is sealed into the potometer using a rubber bung. An air bubble is introduced to the capillary tube. The distance the bubble travels shows how much water the stem has taken up.
    4. 4. 1. Record a definition of transpiration2. Where do plants lose water?3. Transpiration will often lead to water loss by the plant so what is its purpose and what is the major advantage?
    5. 5. Transpiration• Sort the statements out into the correct order to show how water moves to the top of the plant
    6. 6. TranspirationExperiment Distance bubble moved after each minute in mmTime in 1 2 3 4 5 6 7 8 9 10minA 2 3 5 7 10 11 13 15 18 20B 13 24 38 49 73 75 89 114 118 152C 5 12 18 24 30 35 41 47 53 58
    7. 7. Is the rate of transpiration constant?Transpiration is a bit like a straw, pulling water upthe plant. Sometimes the pulling force will bestronger and the plant will lose more water.The speed at which a plant loses water is calledthe rate of transpiration.What environmental factors will affectthe rate of transpiration?  humidity (amount of moisture in the air)  light intensity  temperature  air movement (wind).
    8. 8. How does a plant control water loss?1. Waxy waterproof layer (cuticle)2. Stomata on the underside of the leaf (not expose to sun)3. Wilting. Leaves collapse reducing surface area4. Stomata close