Dependent and Independent Variables

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Lab 1: Dependent and Independent Variables

Lab Results

Table 1: Average Yield for each seed variety at no, low, and high infestation levels (8 points)
Seed Variety
Level of ECB Infestation
Pot 1
Yield
Pot 2
Yield
Pot 3
Yield
Average
Yield
BT 123

None
160.1
164.8
164.2
163.03

Low
164.0
162.6
168.3
164.97

High
155.1
163.0
163.9
167.67
BT 456

None
190
183.2
184.8
186

Low
178.8
172.6
179.6
177

High
157.3
157.0
159.0
157.76
Golden

None
181.6
182.8
189.8
184.73

Low
177.9
171.2
170.6
173.23

High
135.4
139.6
138.3
137.76
Super Harvest

None
164.1
164.3
161.9
163.43

Low
159.1
155.0
157.5
157.2

High
125.5
129.0
130.0
128.16

Table 2: % Reduction in yield for each seed variety at high levels of infestation (4 points)
(transfer data on average yield with no infestation and high infestation from Table 1 to Table 2)
Seed Variety
Avg. Yield with
No Infestation
Avg. Yield with High Infestation
% Reduction
In Yield
BT 123

163.03
160.67
1.5%
BT 456

186
157.76
15%
Golden

184.73
137.76
25%
Super Harvest

163.43
128.16
22%

Laboratory Analysis Questions 1. ECB refers to: (1 pt)
a. A genetically engineered plant that is resistant to insect pests
b. Edible corn byproducts
c. An insect pest that reduces corn yield
d. European corn borer
e. c and d

2. How many days are required for a corn seed to become a mature plant with maximum weight kernels ready to be harvested? (1 pt)
a. about 23
b. about 65
c. about 140
d. about 180

3. “BT Corn” refers to corn that: (1 pt)
a. Has been infested with insect pests
b. Has been infected with bacteria
c. Is resistant to ECB
d. Is not affected by pesticides

4. BT is: (1 pt)
a. A stomach poison produced by bacteria
b. A genetically engineered corn product
c. A bacterium carried by the European corn borer
d. A bacterium that has a gene for producing Cry proteins

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