Which of the following would you expect to be happening if a plant is showing water stress?
A. Abscisic acid is being transported to the guard cells.
B. The phloem is transporting abscisic acid upward.
C. Xylem is no longer functioning to carry water up the plant.
D. Blue light is influencing the guard cells.
E. All of the answers are correct.
Answer: A
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The Hubbard Brook Watershed Project illustrated that
a. deforestation can alleviate drought conditions. b. deforestation can result in polluted streams. c. deforestation results in calcium retention in soil. d. primary consumers are the most important part of that energy pyramid. e. trees absorb too much water and are not useful in a watershed area.
Which one of the following expressions from the logistic equation (dN/dt = rN ((K - N)/K) represents the proportion of unused resources remaining for use by the population?
A. the carrying capacity (K) B. the population size (N) C. the biotic potential (rN) D. (K - N)/K E. the growth rate (dN/dt)
Stem cells have the ability to differentiate to form specific cell types, which divide only slowly or not at all
a. True b. False
What is the difference between a parasite and a parasitoid?
A) A parasite is larger. B) A parasitoid is harmless to the host. C) A parasite has only one host. D) A parasitoid typically always kill its host.