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Ch. 39 - Plant Responses to Internal and External Signals
Campbell - Campbell Biology 11th Edition
Urry11th EditionCampbell BiologyISBN: 9789357423311Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoUrry 11th EditionCh. 39 - Plant Responses to Internal and External SignalsProblema 1
Capitolo 39, Problema 1

The hormone that helps plants respond to drought is:
a. Auxin
b. Abscisic acid
c. Cytokinin
d. Ethylene

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1
Identify the main function of each hormone listed in the options: auxin, abscisic acid, cytokinin, and ethylene.
Auxin is primarily involved in cell elongation and growth, particularly in the shoots and roots.
Abscisic acid is known for its role in stress responses, particularly in helping plants cope with drought by closing stomata to reduce water loss.
Cytokinin is mainly involved in cell division and growth, influencing the development of shoots and roots.
Ethylene is a hormone associated with fruit ripening and response to stress, but not specifically drought stress.

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Plant Hormones

Plant hormones, or phytohormones, are chemical substances that regulate various functions in plants, including growth, development, and responses to environmental stimuli. They play crucial roles in processes like cell division, flowering, and stress responses. Understanding plant hormones is essential for identifying how plants adapt to changes such as drought conditions.
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Plant Hormones and Senescence

Abscisic Acid

Abscisic acid (ABA) is a plant hormone primarily involved in regulating plant responses to stress, particularly drought. It helps plants conserve water by inducing stomatal closure, reducing water loss through transpiration. ABA also plays a role in seed dormancy and germination, making it a key hormone in plant adaptation to adverse environmental conditions.
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Acids

Drought Response in Plants

Drought response in plants involves physiological and biochemical changes that help minimize water loss and maintain cellular functions. Key strategies include stomatal closure, root growth alteration, and osmotic adjustment. Hormones like abscisic acid are crucial in signaling these responses, enabling plants to survive periods of water scarcity by conserving resources and maintaining homeostasis.
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Seed Plants - 1
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Domanda del libro di testo

Auxin enhances cell elongation in all of these ways except:

a. Increased uptake of solutes

b. Gene activation

c. Acid-induced denaturation of cell wall proteins

d. Cell wall loosening

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Domanda del libro di testo

Charles and Francis Darwin discovered that

a. Auxin is responsible for phototropic curvature

b. Red light is most effective in shoot phototropism

c. Light destroys auxin

d. Light is perceived by the tips of coleoptiles

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Domanda del libro di testo

How may a plant respond to severe heat stress?

a. By reorienting leaves to increase evaporative cooling

b. By creating air tubes for ventilation

c. By producing heat-shock proteins, which may protect the plant's proteins from denaturing

d. By increasing the proportion of unsaturated fatty acids in cell membranes, reducing their fluidity

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