Simple Fruit

A simple fruit is a type of fruit that develops from a single or compound ovary with only one pistil. Simple fruits cans either be fleshy or dry. Fleshy fruit are those which parts or all of the fruit consists of a fleshy wall, but some fruits are also known as drupes since they have leathery, fibrous, or pulpy outer layers with a pit enclosing one or more seeds (like peaches). Dry simple fruits can either be dehiscent (opening to discharge seeds), or indehiscent (not opening to discharge seeds), some dry fruits are like peanuts and carrots. This picture represents a simple fruit since the banana falls under the category of a fleshy simple fruit since its walls are pulpy and fleshy. 

Source:

Simple Fruit. (June 5, 2009). biology-online.org. Retrieved on August 31, 2011, from 

http://www.biology-online.org/dictionary/Simple_fruit