Which of the following plastid doesn’t store food?

The correct option is chromoplasts.

Plastids are double-membrane-bound organelles found in the cells of plants and algae. Based on their pigments and functions, plastids are broadly categorized into different types:
1. Leucoplasts: These are non-pigmented (colorless) plastids specialized for food storage. Depending on the type of nutrient they store, they are further classified into:

• Amyloplasts: Store carbohydrates (starch), commonly found in tubers like potatoes.
• Elaioplasts (or Oleoplasts): Store lipids, oils, and fats, typically found in seeds.
• Aleuroplasts (or Proteinoplasts): Store proteins, often present in maize grains.

2. Chromoplasts: These are colored plastids containing carotenoid pigments (red, orange, or yellow). They do not store food. Instead, their primary function is to synthesize and accumulate carotenoid pigments, which give color to flowers, fruits, and aging leaves, aiding in attracting pollinators and agents for seed dispersal.

Therefore, among the options provided, chromoplasts do not store food.