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OCEAN 320 Exam 1 | Answered with Rationales

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OCEAN 320 Exam 1 | Answered with Rationales Which of the following is false about PCBs? a) Whales, and dolphins store PCBs in their blubber b) Marine animals are well equipped to handle PCBs c) Cancerous tumors are becoming a product of ingesting PCBs d) Mass die offs may be caused by PCB's The...

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  • September 18, 2024
  • 14
  • 2024/2025
  • Exam (elaborations)
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  • OCEAN 320
  • OCEAN 320

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OCEAN 320 Exam 1


Which of the following is false about PCBs?

a) Whales, and dolphins store PCBs in their blubber
b) Marine animals are well equipped to handle PCBs
c) Cancerous tumors are becoming a product of ingesting PCBs
d) Mass die offs may be caused by PCB's

The decline in the killer whale population in Puget Sound demonstrates they are:

A) negatively effected by climate change.
B) killed and sold for sport.
C) the most PCB contaminated marine mammals in the world.
D) over fished to feed increasing levels of human population.

In reference to the assigned Youtube video "PCBs in Whales", Peter Ross of the
Department of Fisheries & Oceans, Canada explains the negative effect of PCBs on
marine life.

How have PCBs and PBDEs made their way into Pacific Ocean trenches? (More than
one possible answer).

A) Contaminated plastic debris
B) Boat and other vessel pollution
C) Dead animals sinking to the ocean floor
D) Greenhouse gases
E) Industrial accidents and discharge from landfills

Summary of PCBs and the threat they pose to marine mammals Article, Author Paul
Rincon. PCBs and PBDEs first get into the environment though industrial accidents and
discharge from landfills and are unable to be broken down. They then make their way
into Pacific Ocean trenches through contaminated plastic debris and dead animals
sinking to the sea floor. These toxins are then consumed by deep sea creatures and
remain in the food chain.

What are the three general categories of chemical that are a particular concern in the
marine environment:

I. Oil
II. Biotoxins
III. Toxic Metals
IV Persisent Organic Pollutants
V. Caustics

, A. I, II, III
B. I, II , IV
C. II, III, V
D. I, III, IV
E. II, III, IV

(http://www.oceanhealthindex.org/methodology/components/chemical-pollution) "Three
general categories of chemicals are of particular concern in the marine environment: oil,
toxic metals and persistent organic pollutants. Although some countries possess good
data on the occurrence and concentrations of such chemicals in their waters, such data
are not available globally. Therefore, proxy methods were used to estimate the intensity
of chemical pollution based on the amount of pesticides used by each country."

What is problematic about the "Conceptual Model"?

A. The behavior of this model cannot be expected ever to represent the full-scale
phenomenon with complete accuracy.
B. This model can sometimes be too simple for practical use, while sometimes can be
too complex for practical use.
C. This model has very simple rules and instructions that can have consequences that
are extremely difficult to predict without actually carrying out the specific steps.
D. This model only focuses on short term effects and lacks modeling long term effects.

Chapter 11 Common Themes: A conceptual model may have only limited usefulness.
On the one hand, it may be too simple. For example, it is useful to think of molecules of
a gas as tiny elastic balls that are endlessly moving about, bouncing off one another; to
accommodate other phenomena, however, such a model has to be greatly modified to
include moving parts within each ball. On the other hand, a model may be too complex
for practical use. The accuracy of models of complex systems such as global
population, weather, and food distribution is limited by the large number of interacting
variables that need to be dealt with simultaneously

Chemical Pollution has a high effect on which of the following Ocean Health Index
Goals?

A) Natural Products
B) Tourism & Recreation
C) Carbon Storage
D) Coastal Protection

http://www.oceanhealthindex.org/methodology/components/chemical-pollution - For
every Ocean Health Index Goal that exists there also exists certain pressures that have
hold different weight on that goal. Chemical Pollution is a pressure for nearly every
Ocean Health Index Goal but has different effects on each based off a 1 (low) to 3
(high) scale with 3 being the highest pressure. Tourism & Recreation is one of the goals

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