What happens when you cut an apple and leave it in the air?
It turns brown
It gets sweeter
What causes apples to turn brown after cutting them?
The heat from the knife
A chemical reaction with oxygen
Which enzyme makes apples turn brown?
Amylase
Polyphenol oxidase (PPO)
How can you stop apples from turning brown after cutting?
By putting lemon juice on them
By leaving them in the sun
There are kinds of apples that turn brown slower than others.
True.
False.
What does vinegar do to slow down apple browning?
It makes the apple’s surface more acidic
It freezes the apple
Why do apples turn brown when cut?
Because of sunlight
Because oxygen reacts with the apple’s enzymes
If you put an apple in water after cutting it, will it stop it from browning?
Yes, it slows down the browning
No, it speeds up the browning
