Bundle: Biology: The Unity and Diversity of Life, 14th + LMS Integrated for MindTap Biology, 1 term (6 months) Printed Access Card
Bundle: Biology: The Unity and Diversity of Life, 14th + LMS Integrated for MindTap Biology, 1 term (6 months) Printed Access Card
14th Edition
ISBN: 9781305774384
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 30, Problem 1SQ
Summary Introduction

Concept introduction: Plant hormones (phytohormones) are the chemical molecules produced by plant tissues in extremely low concentrations for assisting cardinal functions like flowering, fruit ripening, photo periodism, and stress relief. They also help in sex determination of the flowers produced by the plant. There are five major phytohormones, which are auxin, gibberellin, cytokinine, abscicic acid and ethylene. Each of these also has their own characteristic functions.

Expert Solution & Answer
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Answer to Problem 1SQ

Correct answer: Plant hormones are active in adult plants with different effects in different tissues that often have multiple, overlapping effects especially for developing plant embryos. Therefore, option e. is correct.

Explanation of Solution

Reason for correct answer: Plant hormones are chemical molecules that do many cardinal roles in the plant body. They have different functions in different tissues of adult plants. Many plant hormones have multiple and overlapping effects that are very essential for the growth and development of the plant.

Option e. is given as “all of the above”. Since plant hormones have many important functions in the adult plant body, they have different functions in different tissues especially for developing the plant embryo. Therefore, option e. is correct.

Reasons for incorrect answer:

Option a. is given as “often have multiple, overlapping effects”. Plant hormones are the chemical compounds produced by the plant body. Other than multiple effects, they are only functional in adult plants. Moreover, they do different functions in different tissues especially in developing the plant embryo. Therefore, option a. is incorrect.

Option b. is given as “are active in developing plant embryos”. Plant hormones are chemical compounds produced by the adult plant body. They are very active for developing the plant embryo. Moreover, they do different effects in different plant tissues with multiple or overlapping functions. Therefore, option b. is incorrect.

Option c. is given as “are active in adult plants”. Plant hormones have multiple effects on different tissues of an adult plant body especially for developing the plant embryo. Therefore, option c. is incorrect.

Option d. is given as “may have different effects in different tissues”. Plant hormones have different effects in different tissues. They are very active for developing the plant embryos of adult plants. Therefore, option d. is incorrect.

Hence, options a., b., c., and d. are incorrect.

Conclusion
  Plant hormones or phytohormones are the chemical compounds produced by the adult plant body with multiple or overlapping effect on different tissues especially for developing the plant embryos.

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Students have asked these similar questions
Ethylene respond synergistically with another plant hormone ‘X’ for promoting shedding of leaves, flowers and fruits. The hormone ‘X’ can be used in agriculture for a.Inducing fruit ripening b.Increasing internode elongation c.Reducing requirement of irrigation d.Promoting flowering
ties of the brain and spinal cord B. Match the hormones that are supposed to be added to a plant in order to achieve the following results: a. Auxin b. Gibberellin c. Cytokinin d. Abscisic Acid e. Ethylene 19. unpollinated flowers are treated with this hormone so ovary enlarges and becomes a seedless fruit 20. substitute for temperature or light cues in plant seeds to get them to germinate 21. black spots on banana skin are spots where these are produced inducing ripening 22. seeds/bulbs stay dormant during winter to ensure survival of the plant when it germinates 23. most grape growers spray this in vines to increase length of branches between fruit clusters for more air spaces among fruits to lower fungal infections 24. sprayed on cut leaves and stems so they will remain green longer while unsprayed leaves will tum yellow and die
This class of plant hormones are exuded by the plant roots. On the one hand, these plant hormones stimulate fungal metabolism and branching. On the other hand, they also trigger seed germination of parasitic plants. O A. Auxin B. Gibberellins O C. Strigolactone D. Abscisic acid O E. Ethylene
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