Plant Organ System (OCR GCSE Biology A, Combined (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
13 questions from this quiz
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Practise the questions
13 questions from this quiz
What is translocation?
What is translocation?
Movement of food substances in phloem
What is transpiration?
What is transpiration?
Loss of water vapour from leaves & stems
Why does transpiration occur?
Why does transpiration occur?
It's a consequence of gaseous exchange
What pulls water up through the xylem?
What pulls water up through the xylem?
Attraction between water molecules
How does increased temperature affect transpiration?
How does increased temperature affect transpiration?
Increases it (faster evaporation)
How does high relative humidity affect transpiration?
How does high relative humidity affect transpiration?
Decreases it (reduced gradient)
How does increased air movement affect transpiration?
How does increased air movement affect transpiration?
Increases it (steeper gradient)
How does increased light intensity affect transpiration?
How does increased light intensity affect transpiration?
Increases it (more stomata open)
What does a potometer measure?
What does a potometer measure?
Water uptake by the plant
What shape are guard cells?
What shape are guard cells?
Kidney-shaped
What is the wall structure of guard cells?
What is the wall structure of guard cells?
Thin outer walls, thick inner walls
Where are more stomata found on a leaf?
Where are more stomata found on a leaf?
On the bottom of the leaf
Why are more stomata on the bottom of the leaf?
Why are more stomata on the bottom of the leaf?
Lower surface is shaded & cooler