Which of the following plastid is found in ripe fruits?

The correct answer is chromoplast.

Plastids are double-membrane-bound organelles found in the cells of plants and algae. They are responsible for the synthesis and storage of food. Based on their color, pigments, and function, plastids are classified into different types:

1. Chromoplasts:
These are colored plastids (containing carotenoid pigments such as carotene and xanthophyll, which provide yellow, orange, and red colors). They are primarily found in flowers and ripe fruits. During the ripening process, chloroplasts often synthesize carotenoids and transform into chromoplasts, causing fruits to change color from green to vibrant shades of red, orange, or yellow.

2. Chloroplasts:
These are green-colored plastids containing chlorophyll pigments. They are mainly present in green leaves and stems and are responsible for photosynthesis.

3. Leucoplasts:
These are non-pigmented, colorless plastids that function primarily in storing nutrients such as starch, lipids, and proteins.

4. Amyloplasts:
These are a specific subtype of leucoplasts that synthesize and store starch. They are commonly found in roots and tubers (such as potatoes).

Therefore, chromoplasts are the specific plastids found in ripe fruits that give them their characteristic color.