Glencoe Biology

Section 3: Plant Hormones and Responses

Self-Check Quizzes

1.
What type of growth response causes ivy to grow between the boards of a fence
A)phototropism
B)gravitropism
C)thigmotropism
D)nastic response
2.
Which of the following is an example of a nastic response?
A)grape vine wrapping around a flower pot
B)sunflower bending toward the sun
C)house plant growing toward a window
D)upward growth of a new stem
3.
A plant stem growing towards a window exhibits what kind of response(s)?
A)positive gravitropism
B)positive gravitropism and phototropism
C)negative gravitropism and phototropism
D)nastic response
4.
What is a tropism?
A)growth response to an external stimulus
B)growth response to a hormone
C)structure that produces gas exchange
D)structure that inhibits photosynthesis
5.
What happens when hydrogen ions flow into this cell wall?

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A)hydrogen destroys cell
B)cell shortens
C)water prevented from entering
D)cell wall weakens
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