A plant physiologist treats a leaf with abscisic acid and observes that the stomata close. What happened inside the guard cells during the experiment?
A. Abscisic acid influences the movement of sodium ions out of the guard cells.
B. Abscisic acid influences the movement of potassium ions out of the guard cells.
C. Abscisic acid binds carbon dioxide and causes carbonate crystals to block the stomatal opening.
D. Abscisic acid binds with auxins and induces water molecules to exit the guard cells.
E. Abscisic acid causes the guard cells to become more turgid.
B. Abscisic acid influences the movement of potassium ions out of the guard cells.
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The natural habitat of the bacterium Sphingobacterium is:
a. environment. b. animal oral and respiratory flora. c. environment, cold climates. d. human normal flora.
Worldwide, decay of organic matter is important to the global carbon cycle because it ____ tens of
billions of tons of carbon dioxide each year.
a. removes from the atmosphere b. prevents the planet from losing to space c. returns to the atmosphere d. prevents plants from having access to e. releases to space
Studies have shown that in the flowering plant Arabidopsis the root-shoot axis is established
a. by the first cell division of the embryo. b. within hours after the seed germinates. c. during the torpedo stage of embryonic development. d. shortly after the eight-cell embryo stage. e. by plant tissues breaking through the seed coat and making contact with soil.
You are working on a drug to affect heart function, and you are told to direct the drug to change the relaxation of the ventricles. If your drug is successful, it will alter
A. the oxygen content in the blood. B. the force of contraction of the atria. C. venous pressure. D. diastolic pressure. E. systolic pressure.