Mostly, the flesh of fruit is made of

The correct option is Parenchyma.

Step-by-step Explanation:

1. Understanding Plant Tissues: Plant tissues are broadly classified into meristematic (dividing) and permanent (non-dividing) tissues. Permanent tissues are further divided into simple permanent tissues (made of a single type of cell) and complex permanent tissues (made of multiple types of cells).

2. Types of Simple Permanent Tissues: The three main types of simple permanent tissues in plants are:
- Parenchyma: Composed of thin-walled, living cells that are relatively unspecialized. They are involved in photosynthesis, storage of food and water, and secretion.
- Collenchyma: Composed of living cells with unevenly thickened primary cell walls (thickened at the corners with pectin). They provide mechanical support and flexibility to young growing regions.
- Sclerenchyma (including Sclereids): Composed of dead cells with thick, lignified secondary walls. They provide structural rigidity and mechanical strength.

3. Composition of Fruit Flesh: The flesh of a fruit (the mesocarp or pulp) functions primarily as a storage tissue for water, sugars, and organic acids. Because parenchyma cells have large central vacuoles, thin primary cell walls, and abundant intercellular spaces, they are perfectly suited for storing large quantities of nutrients and water. Therefore, the soft, fleshy, and edible portion of most fruits is predominantly composed of parenchyma tissue.