What is a grain of wheat?

$A$ grain of maize is a/an ........ .

The hesperidium of an orange is a modification of which type of fruit?

$A$ small,dry,one-seeded fruit in which the fruit wall is fused with the seed coat,developing from a monocarpellary ovary,is called:

Dry indehiscent single-seeded fruit formed from a bicarpellary syncarpous inferior ovary is:

Which of the following is a geocarpic fruit?