DENDROLOGY

Detailed explanation-1: -Coconut is a true fruit. True fruit is when the fruit develops from a ripened ovary, it termed as true fruit. whereas the rest of the fruit apple, pear, and cashew nut are not a true fruit because they develop from any part of the flower except the ovary.

Detailed explanation-2: -Botanically speaking, a coconut is a fibrous one-seeded drupe, which is a fruit with a hard stony covering enclosing the seed. A seed is the reproductive unit of a flowering plant.

Detailed explanation-3: -Hence, the fruit of coconut is “drupe".