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.
(b) Explain the role that auxin has in eliciting the plant’s response.
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)
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. (c) Explain how the behavioral responses of the plant affect their overall fitness.
( refer to picture )
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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- Phytochrome is a plant pigment protein that mediates plant infection promotes plant growth mediates morphological changes in response to red and far-red light inhibits plant growtharrow_forwardOn 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_forwardA 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 plantarrow_forward
- 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 divisionarrow_forwardHormones and signal pathways Complete the following paragraph to describe signal transduction as it occurs within plants. Choices may be used more than once or not at all. Chemical signals called play an important role in a plant's ability to respond to a stimulus. These signals bind to receptors, the first step in a cellular response called a may be located in the plasma membrane, the cytoplasm, the nucleus, or the endoplasmic reticulum. The series of relay proteins or enzymes activated by the hormone binding the receptor make up the Some responses are immediate, while others require a like Ca*, to initiate a cellular response. The result of the transduction pathway is a which is often the transcription of specific genes, resulting in some measurable change. hormones reflex arc signal transduction pathway Signal transducers second messenger response Receptor proteins first messengerarrow_forwardWhich type of the following play a role in the gravitropic response of plants according to the statolith hypothesis? amyloplasts chloroplasts receptors calcium ions O O O Oarrow_forward
- which 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_forwardWhat is the gravity receptor involved in gravitropism?arrow_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
- Which of the following hormones are NOT matched with the proper function? abscisic acid- promotes leaf abscission cytokinins-stimulates cell division ethylene- promotes fruit ripening gibberellic acid- promotes stem elongation auxin-promotes increases in cell sizearrow_forwardAlmost all plant communication is by a slow mechanism. What is the mechanism?arrow_forwardbriefly describe the cell elongation in response to auxinarrow_forward
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