Question

Sara and Juan conducted an experiment to test which soil would be BEST for growing plants.

Answer 1

Answer:

A. Type of soil

Explanation:

A control experiment is the one that is used to checkmate the real experiment.

In this case, the fourth jar that contains the mixture of all the types of the soil is considered as the control experiment.

In a nutshell, it should be generally understood here that the type of soil serves as the control for the experiment.

Answer 2

Answer:

D) amount of water given to the seeds

Explanation:

The controlled variable in the experiment would be the amount of water given to the seeds.

A controlled variable in an experimental investigation is a variable that remains unchanged throughout the entire duration of the experiment. It remains unchanged because a slight variation could change the outcome of the experiment and renders the result inaccurate.

In the experiment, the amount of water given to the seeds in the four pots must be constant because water represents an important factor in the growth of plants. A slight variation in the amount of water given to the pots will influence the growth of the plant. It will become difficult to determine if the variation in the growth of the plants is due to the water variation or different soil types.

The correct option is D.