questions 1 and 2 refer to the following. students want to determine how vegetation affects soil erosion. they collect four soil samples of equal starting mass with different types of vegetative cover, as seen in the table below. each sample is placed in a three - sided plastic dish that can drain into a beaker and is exposed to the same amount of consistent, steady rainfall for ten minutes. the water and soil runoff are collected in the beaker and separated. the average values for each sample are provided below.
| soil type | soil with no grass | soil with newly sprouted grass | soil with mature grass | soil with dead grass |
|--|--|--|--|--|--|
| initial mass | 100g | 100g | 100g | 100g |
| final mass | 69g | 92g | 94g | 86g |
| average percent change in mass of soil | 31% | 8% | 6% | 14% |
1 mark for review
which of the following is the control group for this experiment?
a soil with no grass
b soil with newly sprouted grass
c soil with mature grass
d soil with dead grass

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Accepted Answer

# Brief Explanations:
In an experiment to determine the effect of vegetation on soil erosion, the control group is the one without the variable being tested. Here, the variable is vegetation. The soil with no grass has no vegetation and serves as the baseline for comparison against the other soil - samples with different types of grass.
# Answer:
A. Soil with no grass

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Explanation:

Answer:

soil type	soil with no grass	soil with newly sprouted grass	soil with mature grass	soil with dead grass
final mass	69g	92g	94g	86g
average percent change in mass of soil	31%	8%	6%	14%