Question

Formulate your hypothesis. (List down at least 3 hypotheses) about the apple slices turns brown

Answer 1

Answer:

Apple contains iron nutrient.

As the apple is slices, the iron nutrient comes in contact with air which contains oxygen and water vapour.

Due to oxygen and water vapour, iron nutrient in the apple gets oxidised and thus, turns apple slice exposed to air directly turns brown.

Explanation:

Answer 2

The apple slices turn brown because

• Apple slices turn brown because of the oxidation of an enzyme called Polyphenol Oxidase also called PPO.
• When polyphenol oxidase comes in contact with atmospheric oxygen, it turns the phenolic compounds present in the apple tissues into brown-coloured products which impart brown colour to the freshly cut apple.
• To prevent the oxidation of freshly cut apples, citrus fruits must be coated on their surface.