Multiple Choice
The synthesis and release of abscisic acid in a plant is a response to __________.
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37. Plant Sensation and Response
Tropisms and Hormones
Back37. Plant Sensation and Response
Tropisms and Hormones
- Multiple ChoiceWhich of these features is/are characteristic of ethylene?729views2rank
- Multiple Choice__________ appear to allow a plant cell to sense its orientation with respect to gravity.668views
- Multiple ChoiceA rapid loss of water in specialized cells in the sensitive plant Mimosa pudica causes __________.893views
- Multiple ChoiceThe formation of air tubes in submerged roots is an adaptation to __________.1053views
- Multiple ChoiceThe production of organic solutes by plants is a response to __________.778views
- Multiple ChoiceWhen a plant that is not adapted to salty water is exposed to salty water, it will __________.799views
- Textbook Question
The hormone that helps plants respond to drought is:
a. Auxin
b. Abscisic acid
c. Cytokinin
d. Ethylene
1251views - Textbook QuestionTest your knowledge of the five major classes of plant hormones (auxins, cytokinins, gibberellins, abscisic acid, ethylene) by matching one hormone to each lettered box. (Note that some hormones will match up to more than one box.)2250views
- Textbook Question
What does reverse transcriptase do?
1002views - Textbook Question
During winter or periods of drought, which one of the following plant hormones inhibits growth and seed germination?
a. Ethylene
b. Abscisic acid
c. Gibberellin
d. Auxin
924views - Textbook Question
Which of the following statements about hormones is correct?
a. They tend to be large molecules.
b. They exert their effects only on the same cells that produce them.
c. They can exert strong effects only when they are present in high concentrations.
d. They trigger a response by binding to target-cell receptors.
564views - Textbook Question
In autumn, the amount of _________ increases and the amount of _________ decreases in fruits and leaf stalks, causing a plant to drop fruit and leaves.
a. Ethylene … auxin
b. Gibberellin … abscisic acid
c. Cytokinin … abscisic acid
d. Auxin … ethylene
922views - Textbook Question
What evidence suggests that ABA from roots can signal guard cells to close?
a. If roots are given sufficient water, guard cells close anyway.
b. If roots are dry, guard cells begin to close—even though leaves may not be experiencing water stress.
c. Applying ABA to guard cells directly causes them to close.
d. If roots are dry, the ABA concentration in leaf cells drops dramatically.
592views - Textbook Question
Plant hormones act by affecting the activities of:
a. Genes
b. Membranes
c. Enzymes
d. Genes, membranes, and enzymes
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