Question

Pedro and Haley just sliced up an apple and have several pieces left over. They want to keep the apples as fresh as possible so they don't turn brown. They did research and discovered that oxidation (exposure to air) and enzymatic processes cause apples to turn brown. They decided to place the two apple slices in airtight bags and left the other two slices exposed to the air as controls.

Their hypothesis is as follows: Placing apple slices in airtight bags will prevent the apples from browning.

Choose all the alternate methods to test this hypothesis

Place two apple slices in a water solution and two apple slices exposed to air (control).
Cook two apple slices and leave two apple slices exposed to air (control).
Place two apple slices outdoors and two apple slices indoors (control).
Place two apple slices in the refrigerator and two apple slices at room temperature (control).
Wrap two apple slices in aluminum foil and leave two apple slices exposed to air (control).

Answer 1

Answer:

Option A, Place two apple slices in a water solution and two apple slices exposed to air (control).

Option D, Place two apple slices in the refrigerator and two apple slices at room temperature (control).

Option E, Wrap two apple slices in aluminum foil and leave two apple slices exposed to air (control).

Explanation:

It was observed by Pedro and Haley that oxidation (exposure to air) and enzymatic processes cause apples to turn brown and hence in order to test this hypothesis the following is required -

Divide the entire sample i.e cut apples into two divisions where one set of cut apples  is kept in normal air condition and the other set of apple is kept in any conditions where there is no air (aluminium foil and water) or where there is reduction in enzymatic process (in refrigerator)

Hence, option A, D and  E are correct.