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Lecture 10

BIO208H5 Lecture 10: ENV100 Assignment 1.docx


Department
Biology
Course Code
BIO206H5
Professor
Dr
Lecture
10

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Name: Gulneet Mand
Student ID: 1000654295
Course: ENV100
Assignment 1
Q1: PCBs contaminate remote areas, such as Arctic Lakes, by traveling through contaminated
air.
Q2: Contaminated air containing PCBs has no relationship with their transport to remote Arctic
lakes.
Q3: In order to test this hypothesis, I would collect samples of water from Arctic Lakes to
determine the types of PCBs present in that sample. Then, I would test the air around the Arctic
Lakes to check for the presence of PCBs. If PCBs are present in the air, are they the same kind as
found in the sample of water? If the results reveal that the PCBs found in the air are identical to
the type of PCBs found in the water sample. I would investigate the type of fumes produced by
nearby factories/industries. After conducting a test to confirm that the fumes from
factories/industries contain the same type of PCBs found in the air and lakes, I would conclude
that, PCBs from the fumes produced by factories/industries contaminate the air and the Arctic
Lakes. This occurs because the fumes travel through the air to distant areas like the Arctic Lakes
and PBCs escape from the air into the lakes therefore, contaminating the water.
Q4: Concentration of PCBs in oceans and concentration of PCBs in lakes that are connected to
these oceans, adds up, increasing the level of PBCs in lakes connected to oceans compared to
lakes that are isolated and not connected to any oceans.
Q5: If this hypothesis is true, then lakes connected to oceans will have higher levels of PCBs
compared isolated lakes.
Q6: In order to test this hypothesis, I would take samples of water from both the ocean and the
lakes that are connected to it. First, I would measure the concentration of PCBs in the ocean
water and the lake water separately. Subsequently, I would put both samples of water in one
container and measure the concentration of PCBs again. If the concentration of PCBs in the
water from the container increases or adds up, I would conclude that the concentrations of PCBs
in oceans and lakes connected to these oceans add up which increases the levels of PCBs in lakes
connected to oceans than isolated lakes.
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