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What type of plant products are substances like resin, and gum?

Plant tissues produce resins and gums as metabolic byproducts, that are excreted by the plant cells. They form in specialized structures known as passages ducts. 

Gums are waste products that are typically formed as a result of the disintegration of plant cellulose.

These byproducts are stored in the vacuoles of old cells, such as the xylem. These cells die and eventually fall off.