Which of the following statements is FALSE?
a. Ecologist use models to represent
relationships between biogeochemical
cycles and most ecosystems.
b. The physical environment has virtually no
reservoir for most elements.
c. Inputs from the physical environment and
recycling made possible by decomposers
and detritivores maintain the nutrient
reserves in an ecosystem.
d. In most major ecosystems, the amount of
nutrients that is cycled within the
ecosystem is greater than the amount
entering or leaving the ecosystem in a given
year.
e. Once elements are in the biological part of
the biochemical cycles, they are unlikely to
leave until the organism dies.
B
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Superantigens produce a harmful immune response because
A) they activate too many T cells, causing excessive inflammation and cell damage. B) they initiate a type I allergic response resulting in excessive inflammation. C) too many phagocytes are activated and destroy host tissue. D) a strong immune response is necessary to protect the host from the pathogen.
Control of certain diseases is nearly impossible, because we cannot
A) control vector animals. B) control reservoir animals. C) eradicate organisms from the soil. D) control vector and reservoir animals or eradicate organisms from the soil.
Deserts across the globe are typically characterized by low rainfall and plants and animals that
are well adapted to hot and dry conditions. As such, deserts are an example of a __________.
a. life zone b. habitat c. niche d. limiting resource
The quality of food herbivores ingest is relatively nutrient rich, therefore their digestive systems are
relatively simple.
Indicate whether the statement is true or false.