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
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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
Auxin causes a shoot to bend toward the light by
a. Causing cells to shrink on the dark side of the shoot
b. Stimulating growth on the dark side of the shoot
c. Causing cells to shrink on the lighted side of the shoot
d. Stimulating growth on the lighted side of the shoot
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
Buds and sprouts often form on tree stumps. Which hormone would stimulate their formation?
a. Auxin
b. Cytokinin
c. Abscisic acid
d. Ethylene
Which of the following is a type of defense used by plants to deter herbivores?
a. Chemicals toxic to the herbivore
b. Chemicals that recruit other animals
c. Spines
d. a, b, and c
"Match each definition with the correct term.
Bending of a shoot toward light, Growth response to touch, Cycle with a period of about 24 hours Pigment that helps control flowering Relative lengths of night and day Growth response to gravity Folding of plant leaves at night
a. Phytochrome
b. Photoperiod
c. Sleep movement
d. Circadian rhythm
e. Thigmotropism
f. Phototropism
g. Gravitropism"