RivaM wrote:
A certain variety of spear thistle, a weed that quickly spreads across grasslands, was inadvertently introduced into Canada from the United Kingdom in the late 1960's. This weed takes nutrients and moisture from the soil that would otherwise go to timothy grass, the most common Canadian grass varietal. To help track the spread of spear thistle, the Canadian government has released a fact sheet to farmers to help them identify the weed—the fact sheets contain pictures of the weed and explain its effect on soil; the sheets also ask farmers to report any outgrowths of the weed found on their land.
Which of the following, if true, would provide the most support for the prediction that the agencies' action will have its intended effect?
(A) The spear thistle is one of several foreign weed species that draws nutrients from the soil of Canadian farmers.
(B) The animals that graze on timothy grass on Canadian farms are uninterested in eating spear thistle because of its thorns.
(C) The spear thistle leaves spiny thorns on the ground which can poke holes in timothy grass.
(D) Spear thistles usually draw nutrients out of the soil at night, but timothy grass usually grows during the daytime hours.
(E) Most Canadian farmers use timothy grass as the main varietal with which to feed and nourish their livestock.
The options are very indirect so you must look thoroughly into the question.
... would provide the most support for the prediction that the agencies' action will have its intended effect?
What is agencies' action? It is "the Canadian government has released a fact sheet to farmers to help them identify the weed... the sheets also ask farmers to report any outgrowths of the weed found on their land."
So action is releasing a fact sheet to farmers.
What is the intended effect? to track the spread of spear thistle
So the agencies have released a fact sheet to farmers so that they can track the spread of spear thistle. Now, we need to find the option that provides support to the agencies' action having the desired effect i.e. agencies's plan succeeding.
(A) The spear thistle is one of several foreign weed species that draws nutrients from the soil of Canadian farmers.
If there are several such foreign weed species, it is unlikely that the farmers would be very interested in this particular weed. Hence this option doesn't strengthen the plan.
(B) The animals that graze on timothy grass on Canadian farms are uninterested in eating spear thistle because of its thorns.
Spear thistle is a weed and hence the agencies want to control it. This option does show that the farmers might be interested in tracking spear thistle since it has no use for them while it takes away nutrients that were to be used for timothy grass but we still don't know how relevant timothy grass is to the farmers. Cautiously hold this.
(C) The spear thistle leaves spiny thorns on the ground which can poke holes in timothy grass.
No relevance to the plan.
(D) Spear thistles usually draw nutrients out of the soil at night, but timothy grass usually grows during the daytime hours.
No relevance to the plan.
(E) Most Canadian farmers use timothy grass as the main varietal with which to feed and nourish their livestock.
This shows us that timothy grass is very relevant to most farmers. Hence if there is a weed that is affecting timothy grass, most farmers will take notice. Hence the plan of the Govt to get in touch with farmers to help it track the spread of spear thistle might actually work. This option is much better than option (B).
Answer (E)