Malic acid is most abundantly found in ________.

apple

The correct answer is option 3. apple.

Malic acid is a naturally occurring organic acid that is found in various fruits, particularly apples.

1. Apple:

Apples are known to contain a significant amount of malic acid.

Malic acid contributes to the tart or sour taste of apples, especially in unripe or sour varieties.

Besides apples, malic acid is also found in various other fruits like apricots, cherries, peaches, and pears.

2. Malic Acid:

Malic acid is a dicarboxylic acid, meaning it has two carboxyl groups (-COOH) in its molecular structure.

It is involved in the Krebs cycle, a critical process in cellular respiration, where it plays a role in the generation of energy.

So, when considering the options provided, the correct answer is 3. Apple, as apples are notably abundant in malic acid.