Which of the following represents the collective forces that move water upward in xylem?
a) root pressure
b) gravity
c) transpiration
d) active transport
e) translocation
Answer: c) transpiration
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Where do terrestrial plants obtain the necessary carbon for photosynthesis?
What will be an ideal response?
Which of the following components was NOT
a significant part of the earth's early atmosphere?
a. carbon dioxide b. water vapor c. nitrogen gas d. oxygen gas e. hydrogen gas
If the age-specific fertility rate is such that 100 females of age class x would produce 50 offspring, what is the contribution of age class x to the overall population growth rate?
A. 50 B. 2 C. 0.5 D. 0.75 E. cannot be calculated with this information.
What is the name given to membranes that only allow certain materials to pass through them?
a) Osmosis b) Diffusion c) Impermeable d) Selectively permeable