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Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Active Lecture Questions for use with Classroom Response Systems Biology, Seventh.

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Presentation on theme: "Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Active Lecture Questions for use with Classroom Response Systems Biology, Seventh."— Presentation transcript:

1 Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Active Lecture Questions for use with Classroom Response Systems Biology, Seventh Edition Neil Campbell and Jane Reece Edited by William Wischusen, Louisiana State University Chapter 39 Plant Responses to Internal and External Signals

2 Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings 1.A flash of far-red light during a critical-length dark period a)will induce flowering in a long-day plant. b)will induce flowering in a short-day plant. c)will not influence flowering. d)will increase the P fr level suddenly. e)will be negated by a flash of red light.

3 Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings 2.The heavy line in this figure illustrates the relationship between auxin concentration and cell growth in stem tissues. If the same range of concentrations was applied to lateral buds, what curve would probably be produced? * a)I only b)II only c)III only d)II and III e)either I or III

4 Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings 3.A botanist exposed two groups of plants (of the same species) to two photoperiods, one with 14 hours of light and 10 hours of dark and the other with 10 hours of light and 14 hours of dark. Under the first set of conditions, the plants flowered, but they failed to flower under the second set of conditions. Which of the following conclusions would be consistent with these results? a)The critical night length is 14 hours. b)The plants are short-day plants. c)The critical day length is 10 hours. d)The plants can convert phytochrome to florigen. e)The plants flower in the spring.

5 Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings 4.A botanist discovers a plant that lacks the ability to form starch grains in root cells, yet the roots still grow downward. This evidence refutes the long-standing hypothesis that a)falling statoliths trigger gravitropism. b)starch accumulation triggers the negative phototropic response of roots. c)starch grains block the acid growth response in roots. d)starch is converted to auxin, which causes the downward bending in roots. e)starch and downward movement are necessary for thigmotropism.


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