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Paha777 [63]
3 years ago
15

A researcher is interested in the effects of nitrate and phosphate on plant growth and sets up an experiment in which

Biology
1 answer:
padilas [110]3 years ago
6 0

<em>A control is that group in an experiment that does not receive any treatment and is used for comparison with the test result.</em>

<u>Answer:</u> <em>A) a control</em>

<u>Explanation:</u>

In the experiment mentioned, the control is missing because the test group as mentioned are the plant set that receives the treatment that is the different concentration of nitrate and phosphate.

The effect of these nutrients on growth will be observed and evaluated. The time period of the experiment is one month which might exceed.

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