Biology: Life on Earth with Physiology (11th Edition)
11th Edition
ISBN: 9780133923001
Author: Gerald Audesirk, Teresa Audesirk, Bruce E. Byers
Publisher: PEARSON
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Chapter 46, Problem 5MC
Summary Introduction
Introduction:
Plant hormones coordinate the development and ripening of fruits and seeds. Seed maturation is closely coordinated with fruit ripening because most seeds are dispersed in fruits. Auxins, gibberellins, ethylene, and abscisic acid are the important plant hormones. Tropisms represent the movement towards or away from the specific environmental stimuli. Tropisms are mainly caused by unequal cell elongation. It takes place when a stimulus enhances or inhibits cell elongation without disturbing the rate of cell division.
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Which of the following statements about gravity perception is FALSE?
A. Statoliths are specialized amyloplasts
B. Statoliths are found in statocytes
C. Gravity is sensed from the root cap acropetally through the zone of division
D. Columella cells sense gravity through statolith pressure on the endoplasmic reticulum
E. Auxin is the main hormone involved in gravity response
Identify the wrong match
a.Senescence —Both auxin and ABA promote it
b.Apical dominance — Auxin induces and Cytokinin counteracts
c.Dormancy — Both ethylene and GA break it
d.Callus differentiation — Auxin and cytokinins
Which of the following statements is false?a. Auxin and gibberellin promote stem elongation.b. Cytokinin triggers growth of lateral buds.c. Abscisic acid promotes water loss and dormancy.d. Ethylene promotes fruit ripening and abscission
Chapter 46 Solutions
Biology: Life on Earth with Physiology (11th Edition)
Ch. 46.1 - list six important types of plant hormones?Ch. 46.1 - Prob. 2CYLCh. 46.2 - Prob. 1CTCh. 46.2 - explain the roles of plant hormones in seed...Ch. 46.2 - Explain how the Darwin experiments using caps and...Ch. 46.2 - Prob. 2CYLCh. 46.2 - Prob. 2TCCh. 46.2 - Prob. 3CYLCh. 46.2 - Prob. 3TCCh. 46.2 - Prob. 4CYL
Ch. 46.2 - Agricultural biotechnologists have developed...Ch. 46.2 - Prob. 5CYLCh. 46.2 - Prob. 6CYLCh. 46.3 - Although insects are major plant predators,...Ch. 46.3 - Prob. 1CYLCh. 46.3 - Prob. 1HYEWCh. 46.3 - Prob. 1TCCh. 46.3 - Prob. 2CYLCh. 46 - A student reporting on a project said that one of...Ch. 46 - Prob. 1FIBCh. 46 - Prob. 1MCCh. 46 - Compare phototropism and gravitropism in roots and...Ch. 46 - Prob. 2ACCh. 46 - Prob. 2FIBCh. 46 - Prob. 2MCCh. 46 - Prob. 2RQCh. 46 - Prob. 3FIBCh. 46 - Prob. 3MCCh. 46 - What is a phytochrome? How do the two forms of...Ch. 46 - Prob. 4FIBCh. 46 - Prob. 4MCCh. 46 - Which hormones cause fruit development? Which...Ch. 46 - The hormone _________ causes stomata to close when...Ch. 46 - Prob. 5MCCh. 46 - What is senescence? Describe some changes that...Ch. 46 - Prob. 6RQCh. 46 - Describe one example of a plant chemical defense...Ch. 46 - Describe how a sensitive plant closes its leaves....
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- The apical bud of a plant produces which inhibits lateral bud growth through the process known as apical dominances. Select one: O a. Auxin O b. Cytokinin O c. Ethylene O d. Gibberellin O e. Abscisic Acidarrow_forwardWhich of the following is considered essential for germination? Select one: a. Abscisin b. Cytokinin c. Gibberellins d. Auxinarrow_forwardExamples of plant hormones includea. cyclic AMP, IP3, and calcium ions.b. calcium, CDPKs, and DELLA proteins.c. auxin, cytokinin, and gibberellin.d. cryptochrome, phototropin, and phytochrome.e. statoliths, pulvini, and aerenchyma.arrow_forward
- Which of the following is True?a. Ethylene stimulates abscission layers to form.b. Abscisic acid causes abscission layers to form.c. Ethylene is sometimes sprayed on flowers to keep them fresh.d. Abscisic acid stimulates seed germination.arrow_forwardWhich of the following statements about phototropism is/are not true? A. Red light is the most effective light wavelength for positive phototropism of plants. B. Higher auxin concentration on the lighted side causes that side to elongate more than the non illuminated side. C. Phototropins are the only effective light receptors in phototropism. D. Phototropism decreases the plant's ability to enhance photosynthetic capacity. E. All of the above F. None of the abovearrow_forwardWhich of the following may stimulate the growth of the roots in plant cuttings? Select one: a. The use of auxins. b. A decrease in soil minerals. c. A decrease in enzymes. d. The use of endocrine secretions.arrow_forward
- Which of the following statements is incorrect? a. Vascular bundles are arranged in a ring in the outer parts of monocot stems in whereas in eudicots they are scattered throughout the stem. b. The cuticle is a hydrophobic layer that covers the aerial part of plants c. Vascular bundle arrangement is different in stem and root. d. The epidermis and periderm form the dermal tissue of plants.arrow_forwardWhich of these is caused by the effects of auxin? (choose all that apply) 1.Maintaining apical dominance 2.suppressing lateral bud growth 3. stimulating root growth in stem leaf buds 4.stimulating root elongation 5. preventing seed germination 6.phototropismarrow_forwardThe summer is not optimal for grape growing and you're searching in your memory for something regarding plant hormones. Explain 2 ways you could utilize plant hormones (choose from auxin, ethylene, cytokinin, gibberellin, abscisic acid, salicylic acid, jasonic acid) to compensate for a problem during growing. For each way:arrow_forward
- Some plants are recognized by fungal pathogens on the basis of their stomatal pores. Which of the following would provide these plants immunity from fungal infection? a. Removing all of the stomata from the plant b. Changing the spacing of stomatal pores in these plants c. Reinforcing the cell wall in the guard cells of stomatal pores d. Increasing the number of trichomes on the surfacesarrow_forwardWhich one of the following statements about root hairs is CORRECT? Select one: a. They are found in the zone of cell elongation and help the root to fix nitrogen. b.They are found in the root cap and help the root sense gravity. c.They are found in the zone of cell division of the root and help anchor the plant in the soil. d.They are found in the root apical meristem and help the root to absorb water. e.They are found in the zone of cell differentiation in the root. Which of the following best describes the route to fruit formation in flowering plants? Select one: a. 1) pollination, 2) double fertilization, 3) embryo develops, 4) ovary matures, 5) ovule matures. b. 1) pollination, 2) germination of pollen, 3) endosperm develops, 4) ovule develops. c. 1) pollination, 2) endosperm develops, 3) embryo develops, 4) ovule matures. d. 1) pollination, 2) fertilization, 3) embryo develops, 4) ovary matures. e.1) pollination, 2) fertilization, 3) germination of pollen, 4) ovule…arrow_forwardPlant cells communicate in a variety of ways to elicit cellular responses. In the figure below the plant is responding the presence of light with the release of auxin. Auxin was first discovered for its ability to promote growth in plants. It is a plant hormone that inhibits the lengthening and stimulate the formation of lateral roots and root hairs. (b) Explain the role that auxin has in eliciting the plant’s response.arrow_forward
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