The uptake of nutrients by roots requires energy because the

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Nutrient uptake by roots requires energy because the concentration of nutrients in the soil is much more dilute than the concentration in the root cells. As a result, roots have to actively transport nutrients into the cells against the concentration gradient, which requires the use of energy. Option A is incorrect because if the concentration of nutrients in the soil were greater than in root cells, diffusion would occur and no energy would be required for uptake. Option C is incorrect because if the concentrations of nutrients in the soil and in root cells were equal, there would be no gradient to drive nutrient uptake. Option D is incorrect because the waxy layer on root hairs does not require energy for nutrient uptake.

The Uptake of Nutrients by Roots Requires Energy Because the