The conspicuous part of a fern plant is a _____.
a) diploid sporophyte
b) haploid gametophyte
c) diploid gametophyte
d) diploid sorus
e) haploid sporophyte
Answer: a) diploid sporophyte
Explanation: In ferns, while the gametophyte generation is independent, the diploid sporophyte is much larger.
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Which one of the following statements about hypotheses is incorrect?
A. Hypotheses make predictions about observations not yet made. B. A collection of related hypotheses that endures repeated testing is called a theory. C. Hypotheses can be tested by experiments or by making additional observations. D. Hypotheses that provide reasonable explanations do not need to be tested. E. All of the above statements about hypotheses are correct.
True or false: The loop of Henle represents a countercurrent exchanger because it creates a concentration gradient rather than simply maintaining it
A. true B. false
Why are gymnosperms no longer restricted to moist environments, as are ferns and mosses?
A) Because they have a new adaptation, seeds, that allow gametes independence from water B) Because they have a new adaptation, cones, that group gametes together C) Because they have a new adaptation, vascular tissues, that allow for the transport of water D) Because they have a new adaptation, lignin, that allows better transportation of water
The anthrax attack of Fall 2001 was accomplished by mailing the agent in ordinary envelopes. This method of delivery took advantage of the ability of Bacillus anthracis to produce (aerosols/endospores/spores).
Fill in the blank(s) with the appropriate word(s).