In liverworts, the gametophyte generation is a flat, branching, ribbonlike plate of tissue closely pressed against damp
soil called a ____.
a. rhizoid
b. gemmae
c. antheridium
d. archegonium
e. thallus
ANSWER: e
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El Niño is a recurring weather phenomenon
that a. increases global warming. b. stabilizes world climates. c. produces a fluctuation in global weather. d. depletes the ozone layer. e. increases oceanic productivity
In a chromosomal inversion a segment of a chromosome is:
a. reversed. b. duplicated. c. lost. d. attached to a nonhomologous chromosome. e. deleted
Which of the following is not something that causes guard cells to close?
A. too little water in the leaf B. too much CO2 in the leaf C. presence of abscisic acid D. too little CO2 in the leaf E. too much water vapor outside the leaf
Which of the following is NOT an assumption that has to be met to use the chi-square goodness of fit test?
A. The population is 5 times as large as the sample B. The expected value of the number of sample observations in each level of the variable is at least 5 C. The variable under study is categorical D. The sample method is simple random sampling