Question

part a
when designing a control solution, the student wants to use methods that will
have the least negative impact on native species and on the ecosystem. the
student claims that mechanical methods in table 2 can have the least harmful
effects on other organisms in the ecosystem.

which statement best evaluates the student’s claim?

○ a. the student’s claim is correct, because pod weevils are a biological
control method.

○ b. the student’s claim is incorrect, because triclopyr application is a
chemical control method.

○ c. the student’s claim is incorrect, because burning, scarification, and
digging up are mechanical control methods.

○ d. the student’s claim is correct, because brush cutting and
scarification are mechanical control methods.

part b
choose the statement that best supports the answer to part a.

○ a. brush cutting targets mature scotch broom plants.

Explanation:

Part A

• Option A: Talks about biological control (pod weevils), not mechanical, so irrelevant. Eliminate.
• Option B: Discusses chemical control (triclopyr), not mechanical. Eliminate.
• Option C: Mechanical methods like burning, scarification, digging up can harm native species/ecosystem (e.g., burning kills other organisms, disturbs soil). So the claim that mechanical methods have least harmful effects is incorrect. This option correctly evaluates the claim.
• Option D: Just states they are mechanical, not if they have least harm. Doesn't evaluate the claim's accuracy. Eliminate.

Answer:

C. The student’s claim is incorrect, because burning, scarification, and digging up are mechanical control methods.

Part B (Assuming Part A answer is C, we need to find a statement supporting that mechanical methods (like burning, scarification, digging) harm the ecosystem. But since only option A is shown here, if we assume the full options include one about mechanical methods harming: However, with the given option A: "Brush cutting targets mature Scotch broom plants" – if Part A's answer is C (claim is incorrect as mechanical methods can harm), a supporting statement would show mechanical methods' negative impact. But the given option A just says brush cutting targets a plant, not harm. If this is a partial list, but with the given, perhaps a typo. But based on Part A's answer C, a supporting statement would explain how mechanical methods (like burning, etc.) harm. If we take the given option A, it's not a good support. But likely, the correct support would be about mechanical methods' negative effects. (Note: Since the full Part B options aren't shown, but based on the problem, if we proceed with the given option A, it's not a support. But assuming the intended support, e.g., "Burning can kill beneficial insects and microorganisms in the soil" – but with the given, perhaps the user missed options. However, with the given option A, it's not a support. But for the sake of the problem, if we assume the answer to Part B (with given option A) is not A, but since only A is shown, maybe a mistake. But based on Part A's answer C, the support should be about mechanical methods harming. If we have to choose from the given (only A), it's not correct. But likely, the intended answer for Part B (with full options) would be a statement showing mechanical methods' harm. For example, if there was an option like "Burning destroys habitats of small invertebrates", that would support Part A's answer. But with the given, we can't fully answer, but if we proceed with the given option A, it's incorrect. However, since the user provided only option A for Part B, maybe a typo. But based on the problem structure, after Part A's answer C, the support should be a statement explaining why mechanical methods (like burning, etc.) are harmful. So if we assume the full options, the correct one would be the one showing mechanical methods' negative impact on the ecosystem.