Four of the five processes listed below promote
transpiration. Select the exception.
a. potassium ions pumped into guard cells
b. turgor pressure building up in guard cells
c. photosynthesis occurring in guard cells
d. carbon dioxide entering leaf
e. activity of abscisic acid
Answer: e
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Mycorrhizae
a. increase plant growth. b. are symbionts. c. allow a plant to absorb more water. d. increase the surface area for absorption of water and minerals. e. have all of these characteristics
The production of light by an organism is called ____
a. autophotoproduction b. bioluminescence c. luminarianism d. autoillumination e. bioillumination
The reason that some individual hormones have so many different effects is that
a. they influence gene transcription. b. they trigger a second messenger system that produces a cascade of effects. c. there are a great many different cells in different tissues that have specific receptors for the hormone. d. the hormone is carried throughout the body and only a small amount is needed to produce its effect. e. they are realeased in different concentrations.
Gas exchange occurs when
a. oxygen in the alveoli diffuses into the blood in the capillaries b. oxygen binds with hemoglobin in the red blood cells c. the red blood cells give up oxygen to the cells of the body tissues d. all of the above