Which statement is an accurate interpretation of the outcome in an ecosystem when a major predator is removed?
A. The remaining community adjusts and quickly becomes stable.
B. The diversity of the ecosystem actually increases.
C. The diversity of the ecosystem decreases since there is an increase in competition.
D. The diversity of the ecosystem decreases because parasites become more of a problem.
E. The diversity of the ecosystem decreases because new herbivores move in.
C. The diversity of the ecosystem decreases since there is an increase in competition.
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Which of the following statements regarding fern alternation of generations is not correct?
A. Ferns have a dominant, diploid sporophyte. B. The fern gametophyte is very small, but very hardy. C. Most fern gametophytes are capable of producing both male and female gametes. D. Chemical signals released by gametophytes producing eggs cause other, nearby gametophytes to also produce eggs. E. The diploid zygote will grow to become the sporophyte.
Bryophytes lack vascular tissue and lignin and therefore cannot
A. sexually reproduce. B. grow tall. C. asexually reproduce. D. produce a gametophyte stage. E. produce a sporophyte stage.
The exoskeleton of early marine arthropods can be considered a "pre-adaptation" for life on land because it
A) resisted water loss. B) absorbed light. C) protected against predators. D) reflected ultraviolet radiation.
A plant has a mutation in the gene that codes for systemin. What is the likely consequence of this mutation?
A. Systemin receptors will not be activated and proteinase inhibitor will not be transcribed. B. The mutated form of systemin would be recognized as a pathogen and a hypersensitive response will be initiated. C. R genes will fail to match up with avr genes. D. The plant will have a stronger than normal wound response. E. The levels of jasmonic acid will build inside the cell creating a toxic environment.