In the life cycle of a flowering plant, the ___
a. sporophyte is dominant
b. gametophyte is dominant
c. sporophyte initially is dominant and then the gametophyte becomes dominant
d. gametophyte is initially dominant and then the sporophyte becomes dominant
e. gametophyte and sporophyte are codominant
ANSWER: a
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Old man's beard (Usnea trichodea) and yellow Evernia lichens are sensitive to elevated levels of ____
a. sulfur dioxide b. nitrogen oxides c. nitrate d. sunlight e. fluoride salts
Which essential element is often a limiting factor for plant growth?
a. Calcium b. Hydrogen c. Oxygen d. Phosphorus e. Carbon
A relatively narrow corridor of vegetation along a
stream or river is called a a. ecoregion. b. riparian zone. c. habitat island. d. hot zone. e. refuge.
What is the main reason that the alternative explanations to evolution are not considered scientific?
A. The scientific community is biased and will not look at any other explanation. B. The people suggesting the alternative explanations are not scientists. C. The alternative explanations are not testable by the scientific method. D. All of these are reasons why the alternative explanations are not considered scientific.