Welcome to the Quiz!
This quiz contains 10 questions from a mix of 1 subtopics.
Which of the following best describes photoperiodism?
the sensitivity of plants to water availability
the sensitivity of plants to temperature changes
the sensitivity of plants to nutrient levels
the sensitivity of plants to the levels of light in their environment
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In autumn, what triggers leaf fall in deciduous trees?
lengthening of the dark period
increase in temperature
shortening of the dark period
decrease in water availability
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Which pigment do plants use to sense the duration of light and darkness?
chlorophyll
anthocyanins
phytochrome
carotenoids
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Which of the following is NOT a plant response involving photoperiodism?
breaking dormancy in buds
timing the flowering phase
initiating tuber formation
regulating root growth
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What is the term for when plants lose their leaves?
abscission
photoperiodism
senescence
dormancy
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Which of the following triggers abscission in plants?
lengthening of the dark period during autumn
reduced photosynthesis rates
the need for dormancy to avoid winter-related damage
all of the above
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What hormone is released by leaves during the abscission process?
abscisic acid (ABA)
gibberellin
auxin
ethene
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Which hormone do plants use as a signal for conserving water during periods of heat and drought?
gibberellin
ethene
auxin
abscisic acid (ABA)
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Which of the following is a reason for stomatal closure at high temperatures?
to increase carbon dioxide uptake
to prevent water loss through evaporation
to increase oxygen release
to increase photosynthesis rates
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Describe two ways that plants may respond to freezing temperatures to help their survival.
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