Which of the following biomes would you predict to be dependent on fire to prevent succession by trees?
A. desert
B. chaparral
C. grassland
D. deciduous forest
E. taiga
Answer: C. grassland
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Ehrlich and Raven proposed an "escape and radiate" hypothesis that predicts that:
A. plants that escape their herbivores will radiate, increasing diversity. B. plants that are not eaten will develop more similar traits. C. plants and insects co-evolve toward less species diversity. D. plants will only win the evolutionary "arms race" if they escape to new habitats. E. plants and insects are showing less diversity through time as each adapts to the other's defenses.
If the infecting phage lacks some critical pieces of DNA necessary for replication, it is called
A. incomplete. B. mutated. C. defective. D. vegetative.
Plant cuticles, which reduce water loss, are primarily made of:
a. steroids b. triglycerides c. oils d. waxes e. fats
Which of these statements is true?
a. 75 percent of the causes of infertility remain unidentified. b. Long-term stress can cause early puberty and more frequent menstruation. c. Proper nutrition is an important factor in supporting fertility. d. In vitro fertilization involves injecting sperm into the uterus.