What Is Life? A Guide to Biology with Physiology
4th Edition
ISBN: 9781319065447
Author: Jay Phelan
Publisher: W. H. Freeman
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Chapter 20, Problem 8MC
Summary Introduction
Introduction:
One of the effects of auxins is to initiate rooting in plants.
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Root cells exhibit positive gravitropism with the help ofa. auxin in the root cells.b. amyloplasts in root cells.c. exposure to sunlight.d. a nearby substrate.
Which of the following may stimulate the growth of the roots in plant cuttings?
Select one:
a. The use of auxins.
b. A decrease in soil minerals.
c. A decrease in enzymes.
d. The use of endocrine secretions.
A plant mutant that shows normal gravitropic bending butdoes not store starch in its plastids would require a reevaluationof the role of _____________ in gravitropism.(A) auxin(B) calcium(C) statoliths(D) differential growth
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What Is Life? A Guide to Biology with Physiology
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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_forwardWhich combination of hormones is best for promotingthe formation of lateral roots from pericycle?a. A high auxin level and low cytokinin levelb. A low auxin level and high cytokinin levelc. A high level of auxin and cytokininarrow_forward______is the hormone in most rooting compounds. a. Gibberellin c. Cytokinin b. Auxin d. ABAarrow_forward
- . 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.arrow_forwardPruning plants can promote lateral stems and increased plant biomass by _____________. Select one: a. suppressing cytokinin transport b. suppressing auxin transport c. promoting cytokinin transport d. promoting auxin transportarrow_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
- Which of the following statements is false?a. Auxin and gibberellin promote stem elongation.b. Cytokinin triggers growth of lateral buds.c. Abscisic acid promotes water loss and dormancy.d. Ethylene promotes fruit ripening and abscissionarrow_forwardWhich of the following statements about gravity perception is FALSE? A. Statoliths are specialized amyloplasts B. Statoliths are found in statocytes C. Gravity is sensed from the root cap acropetally through the zone of division D. Columella cells sense gravity through statolith pressure on the endoplasmic reticulum E. Auxin is the main hormone involved in gravity responsearrow_forwardWhich of the following is considered essential for germination? Select one: a. Abscisin b. Cytokinin c. Gibberellins d. Auxinarrow_forward
- Phytochrome is a plant pigment protein that: a. mediates plant infection b. promotes plant growth c. mediates morphological changes in response to red and far-red light d. inhibits plant growtharrow_forwardGaseous hormones are able to enter cells without requiring specialmembrane transporter. Which of the major plant hormones is adiffusible gas?a. auxin b. gibberellin c. cytokinin d. ethylene e. abscisic acidarrow_forward1, Choose, Which part of the plant is not included in the shoot systems of plants? a, stem b, leaves c, fruit d, roots 2, Choose, Which of the following is not a plant hormone? a, amylase b, auxins c, gibberellins d, cytokininsarrow_forward
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