Which is NOT one of the three groups of modern
mammals?
a. placentals
b. therapsids
c. marsupials
d. monotremes
e. pouched
Answer: b
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Scientists measured the pressure in the xylem of redwood trees at different heights and found that the higher they made their measurements, the lower the pressure. They extrapolated this to a pressure of zero, and concluded that the tallest a tree could grow is 122–130 meters. The tallest known tree on Earth is 112.7 meters. What assumption were the scientists making to conclude that when pressure was zero, the plant could grow no further?
A. Turgor pressure would be greater than gravity. B. Transpiration would be less than uptake of water from the xylem. C. Leaves above that point would not receive any sunlight. D. Leaves above that point would not receive any water. E. Stems above that point could not transport sugars in their xylem.
Short bones
What will be an ideal response?
The splitting of water and the generation of oxygen occur where?
A. photosystem II B. the Krebs Cycle C. photosystem I D. the Calvin Cycle
What is most likely to happen if the guppy population plotted in Figure 5 is transferred into a habitat with aggressive predators?
A. The population coloration will be brighter. B. The population coloration will be drabber. C. The population will go extinct. D. Either B or C is likely to happen. E. Either A or C is likely to happen.