Though chemical composition of pollen from different plant species varies over a fairly wide range, generally it contains: proteins 7-40%; fats 1.52.3%, carbohydrates 7-12%, minerals 2.8-10.6% and traces of enzymes, hormones, vitamins, pigments and other components.
Nectar, an aqueous sweet secretion by nectaries contains 5-80% sugars. Depending on the position, the nectaries may be floral or extra floral. Bees also feed on honeydew secreted by plant-feeding insects such as aphids. Nectar is eventually transformed into honey by an enzyme action and evaporation. Chemically, nectar is composed of a mixture of various sugars.
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