Introduction:
The chemical substances that are responsible for accelerating, inhibiting, or affecting the growth of plants in any manner are called plant hormones. These are also termed as plant growth factors. These are involved in pathogen defense, regulation of organ size, embryogenesis, reproductive development, and stress tolerance.
Answer to Problem 1TYK
Correct answer:
The plant hormones like auxins, cytokinin, ethylene, and gibberellins are all involved in the stimulation of cell division.
Explanation of Solution
Justification/explanation for the correct answer:
Option (e) is given as: all stimulate cell division. The auxins are involved in stimulating the division of the cell and its further elongation. It is present in the apical buds’ meristem, young leaves, and seed embryo. The cytokinins are involved in the stimulation of the growth of lateral buds, cell division, and apical dominance. These hormones are transported to the different parts of plants from its synthesis center. The gibberellins are involved in stimulating the growth of fruits, seeds, and stems by stimulating the cell division in these areas. They also stimulate the elongation of cells. Ethylene is responsible for stimulating cambial cell division and forms xylem. Abscisic acid (ABA) does not stimulate cell division. Hence, option (e) is correct.
Justification/explanation for the incorrect answers:
Option (a) is given as auxins. Auxins are needed for the division of cells and for its elongation. They alone do not help in the cell division as cell division also requires cytokinins, ethylene, and gibberellins. So, it is an incorrect option.
Option (c) is given as cytokinins. The growth of lateral buds and the apical dominance is done by cytokinins. The cytokinins stimulate cell division along with ethylene, gibberellins, and auxins. So, it is an incorrect option.
Option (d) is given as ethylene. The cell division required for the formation of xylem is done by ethylene. The division of cells is also done by the auxins, gibberellins, and cytokinins. So, it is an incorrect option.
Option (e) is given as gibberellins. The cell division in the areas of fruits, seeds, and stems is done by the gibberellins. The gibberellins alone do not stimulate cell division as cytokinins, auxins and ethylene also contribute to it. So, it is an incorrect option.
Hence, options (a), (b), (c), and (d) are incorrect.
Therefore, it can be concluded that the chemicals that are involved in stimulating and regulating the growth of plants are plant hormones. The hormones that stimulate plant growth are auxins, gibberellins, ethylene, and cytokinins. The plant hormone that does not stimulate cell division is abscisic acid.
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Chapter 37 Solutions
Biology: The Dynamic Science (MindTap Course List)
- 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_forwardPlants hormone that induces cell division is: A. auxins B. gibberellins C. kinins D. dominsarrow_forward
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- 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_forwardYou are trying to get some seeds started by soaking them in water. A few of the seeds are not taking in water or germinating- you suspect that their seed coat has excessive amounts of the hormone, that is keeping them from germinating. Select one: O A. В. C. D. O E. O F. G. O H. OI. J. O K. OL. O M. N. O. O P. R.arrow_forwardWhich hormone can regulate guard cells? Select one: a. ethylene b. abscisic acid c. gibberellin d. cytokinin e. auxinarrow_forward
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
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