water movement in plants
DESCRIPTION
Water movement in plants . What is transpiration?. Starter: Look at these wet clothes, how are they going to dry? Even in winter?. Glossary . Transpiration – the loss of water vapour from the leaves of plants through the stomata when they are open to allow gas exchange for photosynthesis. - PowerPoint PPT PresentationTRANSCRIPT
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Water movement in plants What is transpiration?
Starter: Look at these wet clothes, how are they going to dry?Even in winter?
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Glossary
• Transpiration – the loss of water vapour from the leaves of plants through the stomata when they are open to allow gas exchange for photosynthesis.
• Done?Write down the word and symbol equation for photosynthesis.1) Where does each reactant come from?2) What happens to each product?
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Notes
• Carbon Dioxide enters through the stomata when they are opened.
• Air diffuses in and fills the spaces in the leaf along a concentration gradient.
• At the same time oxygen that has been produced diffuses out of the leaf down its concentration gradient.
• When the stomata are open, water also diffuses out…. Why is this potentially a problem?
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• Gases move into and out of leaves through stomata – these can open and close depending on the time of day or year.
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Lets investigate
• Celery!
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Getting water in and out of a plant.
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Lets look at some stomata….
Diagram of stomata and guard cells.
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Transpiration in plants
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A word from everybody's Fantasy Grandad
• http://www.youtube.com/watch?v=w6f2BiFiXiM
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What features do roots have to allow effective uptake of water and minerals?
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Lets investigate the rate of transpiration
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Or Lets investigate
• Use a wick to model transpiration• Wick , boiling tube, drinking straw, blotting
paper and card.
• This represents the leaf transpiring.
• TASK: describe the model and relate it to transpiration in a real plant.
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Look at these wet clothes, how are they going to dry?Even in winter?How can you increase the rate at which the laundry dries?
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Factors that affect transpiration
Anything that increases PHS increases the transpiration rate.
Hot, dry and windy conditions also do- why?
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Notes
• Transpiration is the loss of water vapour through the stomata in a leaf, causing the water to be pulled up the stem from the roots.
• Transpiration will increase in the day time as stomata are opened up to let CO2 in and O2 out.
• On a hot or dry day transpiration will also increase as there is a bigger water concentration gradient built up between the leaf and the atmosphere.
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Water Tension
• Water constantly diffuses out of the plant leaves as there is less water outside the plant.
• Water moves down a Concentration gradient.
• Roots bring water into the plant bringing minerals into the plant. Water moves into the xylem vessels and through the plant
• Check out your celery.
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Complete the adaptation sheet
• Done? Start the past paper questions.
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Plenary
• Why do trees die when you cut through the bark all round the tree?