Dependent and Independent variables

Virtual Lab: Dependent and Independent Variables
Worksheet

1. ECB refers to: E (European corn borer)
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? D (about 140 days)
a. about 23
b. about 65
c. about 140
d. about 180

3. “BT Corn” refers to corn that: D (Is resistant to ECB)
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: E (A bacterium that has a gene for producing Cry Proteins)
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

5. Creation of BT corn requires genetic material from all of the following except: A ( European Corn Borer)
a. European corn borer
b. Bacillus thuringiensis
c. a corn plant
d. all of the above contribute genetic material to the production of BT corn

Table 1: Average Yield for each seed variety at no, low, and high infestation levels

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
489.1

Low
164.0
162.6
168.3
494.9

High
155.1
163.0
163.9
482
BT 456

None
190.0
183.2
184.8
558

Low
178.8
172.6
179.6
531

High
157.3
157.0
159.0
473.3
Golden

None
181.6
182.8
189.8
554.2

Low
177.9
171.2
170.6
519.7

High
135.4
139.6
138.3
413.3
Super Harvest

None
164.1
164.3
161.9
490.3

Low
159.1
155.0
157.5
471.6

High
125.5
129.0
130.0
384.5

Table 2: % Reduction in yield for each seed variety at high