Question

What prevents?
A. Gibberellic acid
B. Indole-3 acetic acid
C. Ascorbic acid
D. Abscisic acid

Answer 1

Hint: Cut fruits turn brow within a very short time. This and over-ripened banana are not much desirable to us. Lemon can help us get rid of it.

Complete answer: Lemon is easily available fruit. It is called a citrus fruit because of having lots of citric acid content in it. But there is another acid which makes it loaded with rejuvenating properties –the ascorbic acid.
It is the scientific term to mean vitamin C.
The Over-ripening of banana and browning of cut fruits is the result of oxidation.
The enzyme polyphenol oxidase is involved in the process.
But ascorbic acid is effective because oxygen will react with it before it reacts with the compound present in fruits.

So, the correct option is C. Ascorbic acid

Additional information: Ascorbic acid is beneficial to prevent and treat scurvy, a disease caused due to lack of vitamin C in the body. This medication is prescribed for other uses; ask your doctor or pharmacist for more relevant information.

Note: Vitamin C or ascorbic acid has a low pH level (acidic).
The enzyme polyphenol oxidase works best when the pH level remains within 5-7.
A pH level below 3.0 inactivates the enzyme. Lemon juice has a pH within 2.0 ranges; hence it has a very rich anti-oxidant capability.