Which group of seedless vascular plants was the first to evolve roots?
A) club mosses
B) horsetails
C) ferns
D) whisk ferns
Answer: A
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Researchers studying guppies in Trinidad found that guppies, in streams with high predation, reproduce earlier and more frequently. How would the scientists describe the selective force acting on the guppy population?
A. r-selection B. sexual selection C. density-dependent factors D. density-independent factors E. K-selection
Which of the following statements concerning phytochrome-induced responses is FALSE?
a. All responses are very rapid and short-term. b. Red light causes potassium channels to open. c. The absorption of light by one part of the phytochrome molecule triggers a conformational change in another part. d. Phytochrome activates transcription of the gene for a subunit of rubisco. e. Far-red light causes potassium channels to close.
When conducting a scientific experiment, which of the following is tested?
a) an observation b) a prediction c) a result d) a question e) the null variable
To be scientifically valid, a hypothesis must be
A) part of a theory. B) controlled. C) reasonable. D) testable and falsifiable.