Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 39, Problem 3TYU
Summary Introduction
Introduction: Charles and Francis Darwin conducted experiments on coleoptiles. Their experiment involved four groups of coleoptiles. In the first group of coleoptiles, the tips were removed. In the second group, tips were covered by opaque material. In the third group, the tips were covered by transparent material. In the fourth group, the site of curvature was covered by opaque material.
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. Charles and Francis Darwin discovered that(A) auxin is responsible for phototropic curvature.(B) red light is most effective in shoot phototropism.(C) light destroys auxin.(D) light is perceived by the tips of coleoptiles.
Please answer the following parts:
(a) Explain what Florigen is.
(b) Explain how the floral stimulus, which originates in the minor veins of source leaves, has its effect in the shoot apical meristem.
(c) Describe a classic experiment that demonstrated the existence of Florigen.
The hormone that helps plants respond to drought is (A) auxin. (B) abscisic acid. (C) cytokinin. (D) ethylene.
Chapter 39 Solutions
Campbell Biology
Ch. 39.1 - Prob. 1CCCh. 39.1 - Cycloheximide is a drug that inhibits protein...Ch. 39.1 - Prob. 3CCCh. 39.2 - Prob. 1CCCh. 39.2 - WHAT IF? If a plant has the double mutation err...Ch. 39.2 - MAKE CONNECTIONS What type of feedback process is...Ch. 39.3 - If an enzyme in field-grown soybean leaves is most...Ch. 39.3 - WHAT IF? If a plant flowers in a controlled...Ch. 39.3 - Prob. 3CCCh. 39.4 - Prob. 1CC
Ch. 39.4 - Prob. 2CCCh. 39.4 - Prob. 3CCCh. 39.5 - Prob. 1CCCh. 39.5 - Chewing insects mechanically damage plants and...Ch. 39.5 - Many fungal pathogens get food by causing plant...Ch. 39.5 - Prob. 4CCCh. 39 - What are two common ways by which signal...Ch. 39 - Is there any truth to the old adage, "One bad...Ch. 39 - Why did plant physiologists propose the existence...Ch. 39 - Plants that have acclimated to drought stress are...Ch. 39 - Prob. 39.5CRCh. 39 - Prob. 1TYUCh. 39 - Prob. 2TYUCh. 39 - Prob. 3TYUCh. 39 - How may a plant respond to severe heat stress? (A)...Ch. 39 - Level 2: Application/Analysis 5. The signaling...Ch. 39 - If a long-day plant has a critical night length of...Ch. 39 - Prob. 7TYUCh. 39 - DRAW IT Indicate the response to each condition by...Ch. 39 - Level 3: Synthesis/Evaluation 9. EVOLUTION...Ch. 39 - SCIENTIFIC INQUIRY A plant biologist observed a...Ch. 39 - SCIENCE. TECHNOLOGY, AND SOCIETY Describe how our...Ch. 39 - Prob. 12TYUCh. 39 - Prob. 13TYU
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- 50. Read the given statements and select the correct option. (i) Darwin and Darwin (1880) found that sensation of unilateral illumination was perceived by the coleoptile tip of canary grass. (i) IAA is universal natural auxin, discovered by Kogl et al. (iii) IBA is both natural and synthetic auxin. (iv) Auxins promote the growth of lateral shoots. (a) Statements (i) and (ii) are correct. (b) Statements (ii) and (iii) are correct. (c) Statements (i), (ii) and (iii) are correct. (d) Statements (i), (ii), (iii) and (iv) are correct.arrow_forwardDraw illustrations to bring out the anatomical difference between(a) Monocot root and Dicot root(b) Monocot stem and Dicot stemarrow_forwardWhat are the effects brought by cytokinin in plants? Explain the partnerships between cytokinin with auxin and hormone mentioned in Question 3 a). (i) (ii) Write an account on interactions between gibberellins, indole acetic acid and abscisic acid in plant growth promotion and seed germination.arrow_forward
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- The signaling molecule for flowering might be released earlierthan usual in a long-day plant exposed to flashes of(A) far-red light during the night.(B) red light during the night.(C) red light followed by far-red light during the night.(D) far-red light during the dayarrow_forwardIf a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering? (A) 16 hours light/8 hours dark (B) 14 hours light/10 hours dark (C) 4 hours light/8 hours dark/4 hours light/8 hours dark (D) 8 hours light/8 hours dark/light flash/8 hours darkarrow_forward(a) Please describe the peripheral zone (PZ) genetic program maintains indeterminacy and allows the initiation of lateral primordia in shoot apical meristems. (b) Explain how this genetic program has been used in compound leavesarrow_forward
- Classify the pictured organism. Answers a) monocot angiosperm b) dicot angiosperm c) monocot gymnosperm d) dicot gymnosperm either a) or c) Please explain which one is correct.arrow_forwardWhen you prune shrubs to make them “bushier”—that is, to prevent apical dominance—you are affecting the distribution and action of which plant hormone? (a) auxin (b) jasmonic acid (c) salicylic acid (d) ethylene (e) abscisic acidarrow_forwardThe male reproductive part of the flower, where pollen is located, is called the Question 15 options: a) pistil. b) sepal. c) anther. d) ovary.arrow_forward
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