weed B produce organic compound that inhibit root growth for weed A

 

Question: 17 of 47

INCORRECT

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Two researchers note that when Weeds A and B grow next to each other, the roots of Weed A stop growing when they enter the root zone of Weed B. Since activated charcoal is known to absorb organic compounds, the researchers apply activated charcoal to the soil around Weed B. They note that the roots of Weed A then grow into the root zone of Weed B. Which of the following hypotheses is being tested by the addition of activated charcoal to the soil?

Weed A absorbs activated charcoal, which enhances root growth for Weed A.

This is not the hypothesis being tested.

Weed B grows best in soil that contains few organic compounds.

This is not the hypothesis being tested.

Weed A is attracted to soil that contains activated charcoal.

MY ANSWER

This is not the hypothesis being tested.

Weed B produces an organic compound that inhibits root growth for Weed A.

Since activated charcoal is known to absorb organic compounds, its use indicates that the hypothesis being tested is that Weed B produces an organic compound that inhibits root growth for Weed A.