As water is pulled through the xylem, what
prevents the water column from breaking?
a. the covalent bonds within the water
molecule
b. the polar attraction between the water
molecules and the xylem cell walls
c. the hydrogen bonds between water
molecules
d. the one way valves in the vessel elements
e. a combination of more than one of these
prevents the water column from breaking
C
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The advantage of sexual reproduction over asexual reproduction is
a. that sexual reproduction requires an interaction between two individuals. b. that there is a mixing of genetic information into a new combination in the next generation. c. that it ensures a greater number of progeny. d. that it keeps the number of chromosomes constant more effectively. e. that it allows for the production and use of gametes.
Given that full sunlight has an intensity of approximately 10,000 ft-c, is photosynthesis in the field generally limited by light?
a. Yes b. No
The sixth mass extinction event is due to the activity of ________.
Fill in the blank(s) with the appropriate word(s).
The fact that marsupials are not as diverse in South America as they are in Australia would be classified as what type of evidence for evolution?
A. biochemical B. anatomical C. molecular evidence D. biogeographical E. fossil record