Bio Lab 1-2 Answers

Topics: Hypothesis, Scientific method, Observation Pages: 6 (1638 words) Published: June 12, 2014

Lab 1, Exercise 1
Based on the information in Table 2, what patterns do you observe? The number of fish that I observed in a body of water increases until the dissolved oxygen was at 12 ppm. After that point, the number of fish declines slightly.

Develop a hypothesis relating to the amount of dissolved oxygen measured in the water sample and the number of fish observed in the body of water. When the dissolved oxygen levels increase, the number of fish that I observed will also increase until you reach 12 ppm.

What would your experimental approach be to test this hypothesis? A few of the ways that I approached this question. Some options could include:
Set up a large aquarium with an oxygen source on one end. Measure the dissolved oxygen (DO) at regular intervals in the aquarium. Release fish into the tank and observe which areas they spend the most time in.

Set up multiple small pools with swim ladders between them. Aerate each pool at a different level to create differing DO levels. Release an equal number of fish in each pool and watch to see if they congregate more often in some pools over others.

What are the independent and dependent variables?
Independent Variables: DO content in ppm
Dependent Variables: the fish observed
What would be your control?
Set up an aquarium of the same shape and size where the DO level at a specific level is consistent throughout. If DO is not important, than the fish will be found throughout the tank instead of spending most of their time in one part of the tank.

Set up multiple pools with the swim ladders between them. Aerate each pool the same such that the DO levels are consistent between them. Release the fish and note their distribution.
What type of graph would be appropriate for this data set? Why? A line graph would most appropriate for the data in the table.
Graph the data from the table above.

Interpret the data from the graph made in Question 7.
See number 1.
Lab 1, Exercise 2
When a plant is placed on a window sill, it grows faster than when it is placed on a coffee table in the middle of the living room. Testable
Hypothesis: If I place a plant in a window sill, it will grow faster than if I placed it on a coffee table in the middle of the living room.
Null hypothesis:  If I place a plant in a window sill, it will not grow faster than a plant I placed on a coffee table in the middle of the living room.
Experimental Approach: I would place one plant in a window sill and one in the middle of the living room, and see which one grows faster by measuring their heights daily for one month.
Dependent Variable: The growth of the healthy plants I use for the window sill and in the middle of the living room.
Independent Variable: The amount of sunlight I allow each plant to receive.
Control: The plant on coffee table
Data collection: I will measure the plants before I start growing them, and then measure daily until the experiment is over.
Data presentation: I could use a line graph for each plant showing how fast each plant grows.
Analyze: Depending on which plant grows faster, it will tell me what is more beneficial for the faster growth of plants.
The teller at the bank with brown hair and brown eyes is taller than the other tellers.   Untestable: There could be many tellers with brown hair and brown eyes at the bank.
I caught four fish at seven o’clock in the morning but didn’t catch any at noon. Testable
Hypothesis: If the fish are more abundant early in the morning, then I can catch four fish everyday at 7 o'clock in the morning.
Null hypothesis: If the fish are not more abundant in the early morning, then the fish should be just as abundant at noon.
Experimental Approach: I would go fishing at 7 o'clock and at noon for 5 days to see if I could catch the same number of fish at those times.
Dependent Variable: Fish...
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