[align=justify][box_out][box_in] The characteristic smell or taste of a plant, to insects as well as to humans, depends on its chemical composition. Broadly speaking, plants contain two categories of chemical substances primary and secondary. The primary substances, such as proteins, carbohydrates, vitamins, and hormones, are required for growth and proper functioning and are found in all plants. The secondary substances are a diverse and multitudinous array of chemicals that have no known role in the internal
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