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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
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.
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
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.
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.
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Active Lecture Questions for use with Classroom Response Systems Biology, Seventh.
Photoperiodism, Gravitropism, and Thigmotropism AP Biology Unit 5.
Tropic responses Directional movements by growth in response to a directional stimulus.
Copyright © 2008 Pearson Education, Inc., publishing as Pearson Benjamin Cummings PowerPoint ® Lecture Presentations for Biology Eighth Edition Neil Campbell.
Copyright © 2005 Pearson Education, Inc. publishing as Benjamin Cummings Monocot or Dicot?
Plant Responses to Stimuli Tropism = change in growth pattern in response to an environmental stimulus –Phototropism = response to light Auxin is produced.
Plant Responses to Internal and External Signals Chapter 39.
Control Systems in Plants. Plant Hormones What is a Plant hormone? Compound produced by one part of an organism that is translocated to other parts where.
Lecture #17 Date _______ n Chapter 39 ~ Plant Responses to Internal and External Signals.
Control Systems in Plants. Etioloation and De- etiolation.
Plant Control Systems n It’s a Hormonal Thing!. Tropisms: movement toward or away from a stimulus n Phototropism - growth/movement in response to light.
Growth and development in plants. Response Stimulus Results in survival of species respond by changing their growth pattern Tropism – growth toward.
PLANT RESPONSES TO INTERNAL AND EXTERNAL SIGNALS Chapter 31.
Chapter 39: Plant Responses to Internal and External Signals Jay Swan Cincinnati, Ohio.
PLANT RESPONSE. Tropisms Plant growth toward or away from a stimulus Gravitropism gravity is “+” in roots and “-” in shoots – Plastids containing starch.
Chapter 21 PLANT RESPONSES TO STIMULI. A. Plant Growth Regulated by the action of hormones. Hormone = a chemical messenger produced in one part of a plant.
Chapter 39 Plant Responses to External and Internal Signals.
BEHAVIOURAL ADAPTATIONS Behaviour in Plants (Or is it physiological)
Figure 39.0 A grass seedling growing toward a candle’s light Chapter 39: Plant Hormones.
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THE TEMPEST Your Subtitle Goes Here Unit 4 – Lesson 3 Notes Plant Responses.
Plant Responses to Internal and External Environment Chapter 39.
Chapter 30 PLANT RESPONSES TO STIMULI. A. Hormones and Plant Growth Hormone = a chemical messenger produced in one part of a plant & usually transported.
Ch 39: Plant Responses to Internal and External Signals.
PLANT RESPONSES Gravitropism (geotropism) Response of a plant to gravity Shoots will grow against gravity (upwards) Roots will grow with gravity (downwards)
Plant Development Chapter 31 Part Adjusting the Direction and Rates of Growth Tropisms Plants adjust the direction and rate of growth in response.
Plants must be able to respond to ever-changing environment –How is growth regulated? –When should reproductive structures develop? –When should germination.
WEDNESDAY 2/10/16 Learning Goal: Identify the stimuli that produce plant responses. Warm up: Finish labeling flower parts Homework: Finish packet pages.
Aim: How do plants respond to changes in the environment?
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PLANT RESPONSES TO EXTERNAL SIGNALS Ch 39. A potato left growing in darkness produces shoots that look unhealthy, and it lacks elongated roots After exposure.
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Plant Responses Chapter 39. Signal Transduction Plants have cellular receptors that detect important changes in their environment.
6.L.2.2 Explain how plants respond to external stimuli (including dormancy and forms of tropism) to enhance survival in an environment.
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Plant Growth Hormone Function and Tropisms Whether they are involved in primary or secondary growth, all plant cells and tissues arise from three primary.
Ch.8 Plants. Section 5: Plant Responses and Growth Tropisms – A plant’s growth response toward or away from a stimulus is called a tropism – Touch, light,
Plant timing responses. Like animals, plants have both exogenous and endogenous factors that control rhythms. Circadian rhythms shown by plants include:
Plant Responses to Internal & External Signals Chapter 39.
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