Plant Growth Factors (AQA A-Level Biology): Quizzes
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Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What are plant growth factors?
What are plant growth factors?
Chemical messengers
What type of tropism do shoots display in response to light?
What type of tropism do shoots display in response to light?
Positive phototropism
What directional response do plant roots show to gravity?
What directional response do plant roots show to gravity?
Positive gravitropism
What is the most important plant growth factor?
What is the most important plant growth factor?
IAA (indoleacetic acid)
During phototropism, where does IAA accumulate in the shoot?
During phototropism, where does IAA accumulate in the shoot?
On the shaded side
What effect does high IAA concentration have on root cell elongation?
What effect does high IAA concentration have on root cell elongation?
Inhibits elongation
According to the acid growth hypothesis, what does IAA stimulate transport of into cell walls?
According to the acid growth hypothesis, what does IAA stimulate transport of into cell walls?
Hydrogen ions
In which direction is IAA transported in plants?
In which direction is IAA transported in plants?
Away from shoot and root tips
What did Darwin conclude about the shoot tip in his phototropism experiments?
What did Darwin conclude about the shoot tip in his phototropism experiments?
Tip detects stimulus and produces factor
What did Briggs discover about IAA in response to light?
What did Briggs discover about IAA in response to light?
Light causes uneven distribution