Others, such as acorns and hazelnuts, have a hard, dry shell. Peas, beans and other legumes are soft, dry fruits held in a case called a pod. Apples and pears are false fruits because they include other parts. In an apple, only the core is the ovary. Plums and cherries are called drupes because there are no pips, just a hard stone holding the seed.
Walnuts are also drupes.
An apple is a false fruit. The pips are seeds. A cherry is a drupe, containing its seed within a hard stone. A hazelnut is a fruit with a hard case holding a single fruit. An apple is a false fruit.