Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 29.1, Problem 1TYK
Summary Introduction
Introduction:
The growth of an organism in response to light stimulus is termed as phototropism. Here, the cells which are away from light have chemical auxin when phototropism occurs. The cells which are away from light become elongated cells.
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Plant 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.
a) Describe the plant’s response to the presence of light. (refer to picture)
A house plant that has been placed in the window will grow toward the source of light. Which option is the best possible reason?
auxin becomes less concentrated on the illuminated side of the plant
auxin becomes more concentrated in the roots of the plant
auxin is produced only when the sun shines
auxin inhibits the growth of cells on the shady side, so the cells on the sunny side grow faster
auxin becomes more concentrated on the illuminated side of the plant
Which of the following does auxin cause in the tropism with which it is involved?
increased protein synthesis
increased plasma membrane permeability
hardening of cell walls
cell elongation
rapid cell division
Chapter 29 Solutions
Principles of Biology
Ch. 29.1 - Prob. 1BCCh. 29.1 - Prob. 1TYKCh. 29.2 - Prob. 1CCCh. 29.2 - Prob. 2CCCh. 29.2 - Prob. 1TYKCh. 29.2 - Prob. 2TYKCh. 29.3 - What kind of light does the active conformation of...Ch. 29.3 - Prob. 2CCCh. 29.3 - Imagine a garden that has been planted with...Ch. 29.3 - Prob. 3CC
Ch. 29.4 - Prob. 1CCCh. 29.4 - Prob. 1TYKCh. 29.5 - Prob. 1CCCh. 29.5 - In what way is systemic acquired resistance to...Ch. 29.5 - Prob. 1TYKCh. 29 - Prob. 1TYCh. 29 - Prob. 2TYCh. 29 - Prob. 3TYCh. 29 - Prob. 4TYCh. 29 - Prob. 5TYCh. 29 - Photoreceptor molecules allow plant cells to...Ch. 29 - Prob. 7TYCh. 29 - Prob. 8TYCh. 29 - Prob. 1CCQCh. 29 - Prob. 2CCQCh. 29 - Prob. 3CCQCh. 29 - Prob. 1CBQCh. 29 - How could you increase the resistance of a...
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- Which of the following statements is false? a. Auxin and gibberellin promote stem elongation b. Cytokinin promotes cell division in shoot tips c. Abscisic acid promotes water loss and dormancy d. Ethylene promotes fruit ripening and abscission.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_forwardwhich is true regarding how auxin impacts bending of plants? auxin increases reversible bending (elasticity) auxin causes the increase of proteins that embed in between cellulose in the cell wall auxin travels to the sunny side of the stem to change growth auxin causes an increase in cell division that results in blending 2. Select all that are true regarding plant responses trophic responses are reversible, repeatable movements independent of the position of the stimulus venus fly trap responses are an example of a nastic movement phytochrome only enters the nucleus to change gene expression when in the active form (Pfr) shade or far red light converts the inactive phytochrome (Pr) to the active form (Pfr)arrow_forward
- On a hot, dry day a plant closes its stomata thereby conserving water. Which plant hormone is responsible for the closing of the stomata? ethylene abscisic acid cytokinin auxin gibberellinarrow_forwardSome plant hormones oppose the effect of each other. Auxins and cytokinins for example. Whereas auxins prevent shoots from branching, cytokinins promote the development of branches. What other hormones also exhibit such opposing effects? Explain your answer briefly.arrow_forwardAfter a plant perceives a stimulus and before it can respond, there is another step called _____________ ___________. What happens in this step?arrow_forward
- 1) You exposed a plant to a light that shines on the right side of a plant. Choose the statement that best describes the plant growth towards the light. A. Light destroys auxin, and thus the shaded side grows faster. B. Auxin moves from the lighted side to the shaded side where it stimulates growth. C. Auxin moves from the shaded side to the lighted where it stimulates growth. D. Auxin moves from the shaded side to the lighted side where it inhibits growth. 2)Select a plant hormone that responsible in inhibiting protein breakdown and stimulating RNA synthesis. A. Abscisic acid B. Ethylene C. Cytokinins D. Auxins 3)Select the following organs that produces pollen grains. A. Anther B. Style C. Filament D. Ovule 4)Identify the best description of oviparity. A. Organism that gives birth to offsprings. B. Organism that forms the…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. (c) Explain how the behavioral responses of the plant affect their overall fitness. ( refer to picture )arrow_forwardWhat happens when a stem is positively tropic to a certain stimulus? a. Auxins will respond by increasing the growth rate of the side facing that stimulus.b. The stem will respond by growing towards that stimulus.c. The stem will grow and bend away from that stimulus.d. The stem will respond by accumulating auxins in the side facingthat stimulus.arrow_forward
- Positive thigmotropism is a response in plants in which they move and grow toward an object the plant comes into physical contact with , usually curling around the object. This response of the shoot system benefits the plant by allowing the plant to -arrow_forwardWhich plant hormone is known as germination inhibitor? gibberellin ethylene abscisic acid auxinarrow_forwardWhich of the following statements about age gradients within the plant body is FALSE? Select one: a. Age gradients within the plant body include an apical-basal gradient where the youngest cells are near the apices (tips of shoots and roots). b. Age gradients within the plant body reflect the plant cells’ lack of mobility due to their shared walls. c. Phloem is oldest toward the outermost cell layers of the tree trunk and xylem is oldest toward the innermost cell layers of a tree trunk. d. All of the statements are true. e. Age gradients within the plant cells include walls that are youngest immediately adjacent to the plasma membrane and progressively older toward the middle lamella.arrow_forward
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