Question

why do bees collect nectar from flowers ​

Answer 1

Honey bees collect pollen and nectar as food for the entire colony, and as they do, they pollinate plants. 

Extra info:

Honey bees collect pollen and nectar as food for the entire colony, and as they do, they pollinate plants. 

Nectar stored within their stomachs is passed from one worker to the next until the water within it diminishes. At this point, the nectar becomes honey, which workers store in the cells of the honeycomb

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Answer 2

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$\implies$Honey bees collect pollen and nectar as food for the entire colony, and as they do, they pollinate plants. Nectar stored within their stomachs is passed from one worker to the next until the water within it diminishes. At this point, the nectar becomes honey, which workers store in the cells of the honeycomb.

$\implies$Worker-foraging bees collect nectar by sucking droplets with their proboscis (a straw like tongue, see figure below). The nectar on its own provides immediate energy in the form of carbohydrate sugars. Excess nectar is stored in the bee's stomach until it gets back to the hive

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