There are many grains of starch in the cortex because it represents the reserve food material of plants.
The cortex, in plants, is a vascular tissue responsible for the transport of food (processed sap) from the leaves to the rest of the plant.
Starch grains are the most common solid particles that plant cells develop within plastids.
Starch is the main energy and carbon reserve in plants, this source of food material is consumed during plant metabolism, as food when plants are under stress or as an energy source in seed germination and early seedling stages.
Assimilation starch is a temporary product of photosynthesis and is formed in chloroplasts.
On the other hand, reserve starch is formed in amyloplasts, which are contained in parenchymal cells of the cortex, in vascular tissues of stems and roots, in the pith of stems, in fruits, leaves, fleshy cotyledons and in modified stems.
Therefore, we can conclude that starch grains (ergasstic substances) are found in abundance in the cortex because it represents a reserve of essential molecules for the functioning and maintenance of the cellular structure and necessary for the plant's metabolism.
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