Multiple Choice
How would a houseplant typically respond to sunlight that comes from only one direction?
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37. Plant Sensation and Response
Phototropism
Back37. Plant Sensation and Response
Phototropism
- Multiple ChoiceWhich pigment is primarily responsible for detecting the photoperiod in plants?212views
- Multiple ChoiceWhich of the following plant growth responses is primarily due to the action of auxins?210views
- Multiple ChoiceThe face of a sunflower turns to follow the sun as it moves across the sky. This is an example of:5views
- Multiple ChoiceA conformational change in a substance called phytochrome __________.910views
- Multiple ChoiceWhat happens immediately after a phytochrome is activated by light?1050views
- 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 __________.852views
- 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?973views
- Multiple ChoicePhotoperiodism is __________.903views
- Multiple ChoiceAn Alaskan trapper worried about being attacked by grizzly bears left the lights on in his cabin all the time. Plants just outside the cabin flowered a month early. Which of the following best explains this?994views1rank
- Multiple ChoiceA certain short-day plant flowers when days are less than 12 hours long. Which of the following treatments will result in flowering?944views
- Multiple ChoiceWhat are circadian rhythms?1004views
- 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.
720views - 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.
1147views - 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
975views