Evidence for a finding

Untimed practice

Question 1

Horticulturists have investigated whether reflective ground covers can help young plants receive light on the shaded sides of their leaves. In a greenhouse, researchers placed reflective covers beneath 14 of 28 genetically similar seedlings and dark covers beneath the other 14. After four weeks, seedlings above reflective covers had gained a median of 44 grams of dry mass, whereas seedlings above dark covers had gained 32 grams. The seedlings were grown under one greenhouse lighting schedule and were not followed beyond the four-week period. The experiment suggests that reflective ground covers can increase short-term growth under the tested greenhouse conditions.

Which quotation from the text most directly supports the researchers’ conclusion?

AHorticulturists have investigated whether reflective ground covers can help young plants receive light on the shaded sides of their leaves. BAfter four weeks, seedlings above reflective covers had gained a median of 44 grams of dry mass, whereas seedlings above dark covers had gained 32 grams. CThe seedlings were grown under one greenhouse lighting schedule and were not followed beyond the four-week period. DIn a greenhouse, researchers placed reflective covers beneath 14 of 28 genetically similar seedlings and dark covers beneath the other 14.

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