The Janzen-Connell hypothesis:
A. proposes that interactions with hostspecific
pathogens, herbivores or seed
predators play a role in decreasing plant
diversity.
B. was based on the observation that seeds
often suffer lower rates of herbivory when
growing directly beneath a parent tree.
C. was supported by research that
demonstrated that seeds that disperse far
from their parent tree will escape from seed
predators.
D. was supported by data that indicated that
seed and seedling mortality was not density
dependent, thus favoring more common
species.
E. indicates that rare plants do not survive
well in the tropics.
C
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Choose the true statements about species that show convergent evolution. Check all that apply.
_____ do not share a recent common ancestor _____ must be found in the same biogeographical region _____ subject to similar selection pressures _____ have similar phenotypes
The size of an organism determines its domain
Indicate whether this statement is true or false.
A population of organisms that is reproductively isolated from other populations is considered a:
a. kingdom. b. phylum. c. genus. d. species. e. class.