Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
What is transpiration?
the absorption of water by roots
the transport of water through the xylem
the movement of water from roots to leaves
the evaporation of water from aerial parts of plants
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What happens when stomata open for CO2 absorption?
it provides a pathway for water loss through the open stomata
it prevents water loss from the leaf
it decreases the water potential gradient between the leaf and atmosphere
it increases the humidity inside the leaf
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How does high light intensity affect the transpiration rate?
it has no effect on the transpiration rate
it causes stomata to close, decreasing the transpiration rate
it causes stomata to open for maximum CO2 absorption, increasing the transpiration rate
it increases the humidity inside the leaf, decreasing the transpiration rate
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What happens to the evaporation of water molecules at high temperatures?
it stops completely
it becomes faster due to higher kinetic energy
it remains unchanged
it becomes slower due to lower kinetic energy
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What is the purpose of using a potometer?
to measure the rate of transpiration
to measure the rate of respiration
to measure the rate of photosynthesis
to measure the rate of water uptake by roots
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When cutting the shoot for the potometer, why should it be done underwater?
to remove any impurities from the shoot
to make the shoot more flexible
to increase the surface area for water uptake
to prevent air from entering the xylem
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Why is it important to keep the capillary tube end of the potometer submerged throughout the experiment?
to measure the volume of water lost
to prevent water from being taken up from the tube
to maintain an airtight system
to allow air to enter the tube
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What should be done before recording the rate of bubble movement in a potometer?
change multiple variables at once
keep the leaves wet
remove the shoot from the potometer
give the shoot time to acclimatise
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What happens to water vapour during transpiration?
it moves up a water potential gradient from the air spaces in the leaf into the atmosphere
it remains in the air spaces of the leaf
it moves down a water potential gradient from the air spaces in the leaf into the atmosphere
it moves down a water potential gradient from the atmosphere into the leaf
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Which of the following is true about the relationship between humidity and the water vapour gradient between the leaf and atmosphere?
high humidity decreases the water vapour gradient
humidity has no effect on the water vapour gradient
low humidity decreases the water vapour gradient
high humidity increases the water vapour gradient
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