Why aren't ferns commonly found in deserts?
A. Fern fronds are sensitive to UV light.
B. Fern spores are unable to resist prolonged dry conditions.
C. Ferns are non-vascular and cannot absorb water from deep within the soil.
D. Fern pollen is spread by insects that do not occur in deserts.
B. Fern spores are unable to resist prolonged dry conditions.
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Which of the following is not true of hydrocarbons?
A) Octane is a hydrocarbon. B) Hydrocarbons are insoluble in water. C) Many hydrocarbons are used in living systems. D) Only hydrogen atoms are used to complete the valence requirements of carbon. E) Phospholipids have hydrocarbon tails.
The reservoir of infection for botulism and tetanus is
A. humans. B. soil. C. water. D. animals. E. soil AND water.
If the Hardy-Weinberg equilibrium is met, what is the net effect?
A. evolution leading to a population better adapted to a changing environment B. very slow and continuous evolution with no increased adaptation C. no evolution because the alleles in the population remain the same D. evolution leading to a population better adapted to an unchanging environment
Pure water without applied pressure has a water potential that is equal to
A. atmospheric pressure. B. 1.6 MPa. C. 0.0 MPa. D. infinity. E. -2.0 MPa.