37. Plant Sensation and Response
Phototropism
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Practice this topic
- Multiple ChoiceA conformational change in a substance called phytochrome __________.1346views
- Multiple ChoiceWhat happens immediately after a phytochrome is activated by light?1494views
- Multiple ChoiceYou are interested in determining what part of a plant senses the light, which leads to phototropism. A good first experiment would be to __________.1291views
- Multiple ChoiceSome seeds require light for germination. This process is controlled by the phytochrome system. Which of the following germination treatments would inhibit germination of such seeds?1474views
- Textbook Question
Evaluate the following assertions about phototropism. Select True or False for each statement.
T/F Cells on the illuminated side of a stem elongate more than cells on the shaded side.
T/F Phototropism is triggered by blue light.
T/F Phototropins play a significant role in phototropism.
T/F The bending of the plant is due to cell elongation in response to auxin.
827views - Textbook Question
A barley mutant lacking a gibberellic acid receptor would
a. Fail to make GA.
b. Catalyze starch more quickly.
c. Fail to make α-amylase.
d. Fail to take up water.
1243views - Textbook Question
Auxin enhances cell elongation in all of these ways except:
a. Increased uptake of solutes
b. Gene activation
c. Acid-induced denaturation of cell wall proteins
d. Cell wall loosening
1111views - Textbook Question
Which of the following statements about phytochrome is not correct?
a. It is photoreversible.
b. Its function was understood long before the protein itself was isolated.
c. The Pfr form activates the responses to red light.
d. It is involved in guard-cell opening.
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