It's not always insects that pollinate the flowers; plants may use the wind, birds or even bats as pollinators! With wind-pollinated plants - such as grasses, cereals and some trees - the flowers are very simple, with no bright colours or nice smells as they don't need to attract the insects. These plants have both male and female reproductive parts and they make a lot of pollen. This is why a pollen allergy is called 'hay fever'.
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