39 - spring 36,37,38,39:39 Multiple Choice Identify the...

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spring 36,37,38,39:39 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. The step(s) between a plant's perception of a change in the environment and the plant's response to that change is (are) best called a. a mutation. b. hormone production. c. pH change. d. signal transduction. e. an "all-or-none" response. ____ 2. Which of the following statements is (are) true of plants? a. Unlike animals, plants cannot respond to stimuli. b. Plants are stationary and are incapable of movement. c. Plants adjust their growth and development in response to environmental cues. d. Only A and B are true. e. A, B, and C are true. ____ 3. Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the a. tip of the coleoptile. b. part of the coleoptile that bends during the response. c. root tip. d. cotyledon. e. phytochrome. ____ 4. Plants growing in a partially dark environment will grow toward light in a response called phototropism. Choose the incorrect statement regarding phototropism. a. It is caused by a chemical signal. b. One chemical involved is auxin. c. Auxin causes a growth increase on one side of the stem. d. Auxin causes a decrease in growth on the side of the stem exposed to light. e. Removing the apical meristem prevents phototropism. ____ 5. We know from the experiments of the past that plants bend toward light because a. they need sunlight energy for photosynthesis. b. the sun stimulates stem growth. c. cell expansion is greater on the dark side of the stem. d. auxin is inactive on the dark side of the stem. e. phytochrome stimulates florigen production. ____ 6. Plant hormones produce their effects by a. altering the expression of genes. b. modifying the permeability of the plasma membrane. c. modifying the structure of the nuclear envelope membrane. d. both A and B. e. both B and C only ____ 7. Plant hormones can have different effects at different concentrations. This explains how a. some plants are long-day plants and others are short-day plants. b. signal transduction pathways in plants are different from those in animals. c. plant genes recognize pathogen genes. d. auxin can stimulate cell elongation in apical meristems, yet will inhibit the growth of axil-
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lary buds. e. they really don't fit the definition of "hormone." ____ 8. Which plant hormones might be used to enhance stem elongation and fruit growth? a.
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This note was uploaded on 02/07/2011 for the course BIOS 101 taught by Professor Matthews during the Spring '11 term at DeVry Austin.

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39 - spring 36,37,38,39:39 Multiple Choice Identify the...

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