Why Do Apples Turn Brown?

What enzyme is responsible for starting the browning process in apples?

• Amylase

• Lipase

• Polyphenol Oxidase (PPO)

• Protease

Besides the enzyme PPO, what two substances must be present for an apple to turn brown?

• Water and sugar

• Phenols and oxygen

• Acids and bases

• Vitamins and minerals

What is the brown pigment that forms when an apple is exposed to air?

• Chlorophyll

• Carotene

• Anthocyanin

• Melanin

What is the main purpose of melanin production in plants when their cells are damaged?

• To make the fruit sweeter

• To attract pollinators

• To protect against infection

• To help the plant grow faster