Biology_2007_Virtual_Lab_Answer_Key-1

Biology_2007_Virtual_Lab_Answer_Key-1 - Lab 1: Dependent...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lab 1: Dependent and Independent Variables Analysis The answers are intended only as samples. Answers also depend on how students completed the lab or the random data generated by the computer. 1 . Describe the effects of the ECB infestations you used. Were all corn varieties equally effective at controlling the ECB? How do you know? Answers will vary depending upon the varieties of corn selected and the level of infestation. Students should describe the relationship between the level of infestation and the amount of corn yield. 2. If there was no ECB infestation in a certain year, would a farmer gain or lose financially by planting Bt corn? Explain why The farmer would lose financially by planting Bt corn. The cost of Bt corn seeds is more expensive than other varieties of corn. 3. What might happen if Bt corn affects non-target organisms such as beneficial insects or harmless insects? The balance of the ecosystem might be negatively affected if non- targeted organisms are affected by Bt corn. It may reduce the populations of non- targeted organisms. 4. What might happen if ECB became resistant to Bt? Bt might no longer prove to be an effective pesticide to prevent ECB. This might lead to the need to use other means to rid corn plants of ECB, which may lead to other problems in the environment. 5. Discuss possible benefits and drawbacks of a transgenic organism such as Bt corn? Transgenic organisms are a benefit if they increase the yield of crops. This would help the ever-growing need to provide food to an increasing world population. One drawback to transgenic organisms would be that some animals might have allergic reactions after eating this type of food. 6. A farmer planted a field of Bt 123 corn and wants to estimate the yield in terms of bushels per acre. He counts 22 ears in 1/1000 of an acre. He determines that each ear has about 700 kernels on average. He also knows that a bushel contains about 90 000 kernels on average. What is the farmer’s estimate of yield in bushels/acre? Approximately 171.1 bushels per acre. To find this yield, multiply (22 x 700 x 1 000) to obtain the number of corn kernels produced in one acre. Divide by 90 000 to obtain the number of bushels per acre.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Lab 2: Modeling Ecosystems Analysis The answers are intended only as samples. Answers also depend on how students completed the lab or the random data generated by the computer. 1. Suggest reasons why the information represented in the pyramid of numbers of animals of one of the ecosystems you studied may not truly represent that ecosystem. Many more plant and animal species may be involved. Not all of them may have been observed and counted. Not all food web relationship may be known or covered. 2.
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 01/31/2011 for the course BIO 101 taught by Professor Starks during the Spring '07 term at N.C. A&T.

Page1 / 28

Biology_2007_Virtual_Lab_Answer_Key-1 - Lab 1: Dependent...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online