Sunflower pollen
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Pollen grains come in many different shapes and sizes. Some are smooth, some have spikes and others just defy description. Pollen grains may look like tiny seeds but they carry only half the genetic material needed to form a new plant. If we compare plant reproduction to animal reproduction, the pollen grains would be the male gamete or the "sperm". Pollen grains are all microscopic but there are two different types of pollen. The grains found in fowering plants tend to be sticky and clump together, this is so they will stick to the legs and other body parts of insects and other small animals who usually visit flowers for their nectar. The other type of pollen, found in grasses and grains, such as corn, is carried by the wind and is the cause of allergies such as hay fever.

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