Plants in general require how many essential
elements, both macro and micro, for their
growth and survival?
a. 6
b. 12
c. 16
d. 22
e. 28
C
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At the end of the Permian period a large mass extinction occurred; 90-95% of the marine and terrestrial species were eliminated. Which of the following are thought to be the possible cause(s) of this mass extinction?
A. Glaciation. B. Meteorites colliding with the Earth. C. Volcanic eruptions. D. Competition between marine and terrestrial animals. E. Glaciation or volcanic eruptions.
Bacteria in the _____ make essential vitamins
a. stomach c. large intestine b. small intestine d. esophagus
The reason biologists believe that green algae and land plants, both members of the supergroup Archaeplastida, are related is because both of them possess chlorophyll a and b, as well as cell walls made of starch.
Answer the following statement true (T) or false (F)
Biogeochemical cycles involve
A. the movement of chemicals through ecosystems. B. all chemical elements plus light energy. C. just those nutrients that are limiting for organisms. D. the nutrients used solely by primary producers E. None of the answers are correct.