Exam (elaborations)
ENV121 Midterm Exam 2024| Questions with 100% Solutions| Verified| Latest Update
- Course
- Institution
ENV121 Midterm Exam 2024| Questions with 100% Solutions| Verified| Latest Update
[Show more]
Seller
Follow
Content preview
ENV121 Midterm Exam 2024| Questionswith 100% Solutions| Verified| Latest
Update
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?
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller KenAli. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.79. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
79271 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now