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ENV121 Midterm Exam 2024| Questions with 100% Solutions| Verified| Latest Update
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ENV121 Midterm Exam 2024| Questionswith 100% Solutions| Verified| Latest
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Some coral reefs are protected from being overrun with algae by sea urchin that grazes on the
algae. In one of these reefs, a disturbace even (such as a hurricane) severely damages the
coral reef; however, enough sea urchins live in the system to keep the algal growth under
control while the corals rebuild themselves. Which of the following terms best characterizes
this ecosystem and why?
a. unchanged, because it doesnt really matter what the ecosystem went through as long it
look the same in the end
b. resistant because the ecosystem did not change after the disturbance event
c. resilient, because the ecosystem was able to return to its predisturbance state fairly quickly
d. weak, because a new species invaded the environment after the disturbance event - Ans c.
resilient, because the ecosystem was able to return to its predisturbance state fairly quickly
Marine sponges and a microbe called cyanobacteria have a unique relationship. The sponge
provides protection for the bacteria, and, i return, the bacteria provide nutrients for the
sponge through the process of photosynthesis. Because both organisms benefit, their
symbiotic interaction is mutualistic. However, if the enviorment suddenly change to a point
where the cyanobacteria did not have access to light and thus could no longer photosynthesize,
how would the symbiotic association change?
a. the interaction would become parasitic because the cyanobacteria would continue living
on the sponge, and this would actually suck excess nutrients from the sponge
b. the interaction would likely be become commensalistic because the cyanobacteria would
continue to benefit from living on the sponge, but the sponge would not gain anything or be
hurt by the bacteria (aside from the loss the nutrients that the sponges had been rec - Ans b.
the interaction would likely be become commensalistic because the cyanobacteria would
, continue to benefit from living on the sponge, but the sponge would not gain anything or be
hurt by the bacteria (aside from the loss the nutrients that the sponges had been receiving).
If you wanted to know whether or not an ecosystem was accumulating carbon from
the atmosphere, which of the following would be the best measure?
a. GPP
b. NEP
c. NPP
d. satellite observations - Ans b. NEP
As energy moved up through the feeding (trophic) structure of an ecosystem, how does the
total energy present in biomass change?
a. the energy in biomass drops by 90% at each increasing level
b. the energy in biomass doubles at each level
c. the energy in biomass is reduced by half at each level
d. the energy in biomass stays the same at each level - Ans a. the energy in biomass drops
by 90% at each increasing level
Which set of molecules are both the by-products of cellular respiration and the material input
to photosynthesis?
a. carbon dixode (co2) and water
b. oxygen (o2) and water
c. sunlight and water
d. oxygen (o2) and carbon dioxide (co2) - Ans a. carbon dixode (co2) and water
Why are plants typically limited by one nutirent?
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