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? 1612views
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? 1264views1rank
Multiple ChoiceA certain short-day plant flowers when days are less than 12 hours long. Which of the following treatments will result in flowering? 1219views
Textbook QuestionEvaluate 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 QuestionA 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 QuestionAuxin enhances cell elongation in all of these ways except:a. Increased uptake of solutesb. Gene activationc. Acid-induced denaturation of cell wall proteinsd. Cell wall loosening1111views
Textbook QuestionWhich 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.875views
