10 – To Investigate Factors Affecting the Rate of Transpiration in Plants (LC 2027) (Leaving Cert Biology): Flashcards
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Practise the cards
14 cards from this deck
Definition of potometer
Definition of potometer
Instrument measuring water uptake rate in plants
What potometer measures
What potometer measures
Rate of water uptake by plants
Why cut shoot underwater (potometer)
Why cut shoot underwater (potometer)
Prevents air bubbles entering xylem
Why cut shoot at angle (potometer)
Why cut shoot at angle (potometer)
Increases surface area for water absorption
Role of petroleum jelly in potometer
Role of petroleum jelly in potometer
Creates airtight seal at joints
What is measured in potometer
What is measured in potometer
Distance travelled by air bubble
Effect of air movement on transpiration
Effect of air movement on transpiration
Increases rate by removing water vapour from leaves
Effect of temperature on transpiration
Effect of temperature on transpiration
Higher temp increases evaporation (more kinetic energy)
Effect of light intensity on transpiration
Effect of light intensity on transpiration
Higher light causes stomata to open wider
Effect of surface area on transpiration
Effect of surface area on transpiration
More area = more stomata = more water loss
Effect of thick cuticles on transpiration
Effect of thick cuticles on transpiration
Waxy barrier reduces water loss
Effect of high on transpiration
Effect of high on transpiration
Allows stomata to close more, reducing water loss
Why take multiple readings (potometer)
Why take multiple readings (potometer)
Improves accuracy and reliability
Why dry leaves before experiment
Why dry leaves before experiment
Remove surface water, allow normal transpiration