The plant hormone ____ trigger plant responses to environmental stresses such as cold snaps, high salinity, and
drought.
a. abscisic acid
b. cytokinin
c. oligosaccharin
d. jasmonate
e. ethylene
ANSWER: a
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Commercial fertilizers often add _______________ to the soil
a. carbon and nitrogen b. carbon and phosphorus c. nitrogen and phosphorus d. nitrogen and water
Polyploidy:a
may be the result of more than one sperm fertilizing an egg. b. is not lethal in humans. c. may be the result of the failure of a chromosome to separate during meiosis. d. can be due to nondisjunction for a chromosome. e. is the mechanism of dosage compensation.
Rising concentrations of carbon dioxide (CO2 ) in the atmosphere result in the oceans
A) becoming more acidic. B) becoming more basic. C) containing less dissolved oxygen. D) containing less dissolved carbon dioxide.
If a bacterial cell is in a hypertonic solution, water will move in what direction?
A) Out of the cell B) Into the cell C) Water will be at equilibrium