Why is maize grain usually called as a fruit and not a seed ?

Which part of the fruit, labelled in the given figure makes it a false fruit?

The ……. is a scar on the seed coat through which the developing seeds were attached to the fruit.

Explain structure of drupe fruit with examples.

$A$- Fruit is a mature or ripened ovary, developed after fertilization

$R $- If a fruit is formed without fertilization of the t ovary, it is called a parthenocarpic fruit