Amyloplasts are a type of plastid, which are organelles found in plant cells. They are responsible for the synthesis and storage of starch.

Here's a breakdown:

* Plastids: These are organelles that are involved in various metabolic processes, including photosynthesis, pigment synthesis, and storage.

* Amyloplasts: These are specialized plastids that store starch granules.

* Starch: A complex carbohydrate that serves as a primary energy storage molecule in plants.

So, when a plant cell produces excess glucose through photosynthesis, it is converted into starch and stored within amyloplasts for later use.