Settler Explain how transpiration is a consequence of gas exchange Module 3 Exchange and transport 9.3 Transpiration (2 lessons)
Starter A3 memory game of a labelled potometer Why does transpiration vary? Feature that affects the rate of water How it affects water loss loss Number of leaves
Number, size and position of stomata Presence of cuticle Light Temperature Relative humidity
Air movement or wind Soil-water availability Learning Objectives Define the term transpiration
Describe the factors that effect transpiration rate Success Criteria Define the term transpiration (Grade D C) Describe the factors that affect
transpiration rates and how a potometer is used to measure these (Grade C B) Describe how a potometer, with the aid of diagrams, is Explain how practical investigations are used to used to estimate estimate transpiration rates
transpiration rates (Grade B A) Transpiration Transpiration is the Loss of water vapour from the upper parts of the plant by evaporation.
Transpiration involves 3 processes 1) Osmosis from the xylem to mesophyll cells 2) Evaporation from the surface of the mesophyll cells to the intercellular spaces 3) Diffusion of water vapour from the intercellular spaces out through the stomata Write a step by step journey of how and why a water molecule would travel from the soil into the xylem
Include keywords Minerals, active transport, ATP, water potential endodermis, casparian strip, cortex, water potential gradient, xylem Define the term transpiration (Grade D C) Transpiration rates 8 of 26
Boardworks Ltd 2008 Potometer experiment A potometer is used to estimate transpiration rates. Practical: investigate how wind affects transpiration rate. Demo set up, students to set up experiment and write a method,
Describe the precautions whilst recording results. that should be taken when Include key points using a potometer to shoot is healthy and leaves are dry ensure results are valid cut last 2-3 cm off cut end / cut at an angle and reliable
assemble apparatus / cut shoot, under water ; (Grade B A) check there are no air bubbles in apparatus once apparatus assembled make sure its water tight / air tight / has no leaks ; ACCEPT screw clip tight Problem is that potometer is only an estimate Measures water uptake ; not all water (taken up) is lost . 99% water taken up is lost some water used is used in photosynthesis / making cells turgid
Results Quantitative task Record your raw data in the most suitable form Evaluative task 1)Plot a suitable graph of your results 2)Use your processed data and graph to describe the trends in the data
Why is transpiration important?
Write down your reason on a post it. Share ideas on whiteboard Cools plant Minerals Cells turgid Growth/elongation Water is a raw material in photosynthesis Mineral ions and products of photosynthesis are
transported HD Opening and closing of stoma Why does transpiration vary? plenary
Complete table on factors affecting transpiration worksheet Jan 10 Question 4 - homework Describe the factors that affect transpiration rates and how a potometer is used to measure these (Grade C B) Exam Practice
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