Respuesta :

Starch is not produced in the dark because light is the necessary element in photosynthesis, the way that plants make energy and produces starch.
That's why when we do experiments that test for starch, we must leave the plant in dark areas for 48 hours so that it can use up all the remaining starch before we test any variables.

No, starch is not  produced when a leaf is kept in the dark because photosynthesis is not occur.

Photosynthesis is a process in which plant prepares their own food. In this process, carbondioxide reacts with water in the presence of light forming glucose and oxygen.

Some oxygen is used by the plant in the process of photosynthesis and the extra is released in the atmosphere whereas the glucose is converted into complex carbohydrate i.e. starch which is stored in different parts of the plant body so we can conclude that no starch produced in the dark environment.

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