Thursday, 25 May 2006

Mr Sunshine

Mr Sunshine

Shot outside Chemistry building. Same flower as the 21st May 2006 and 25th May 2006. there is so much pollen dispersed on the flower. Looks like sunflower or maybe chrysanthemum.

Pollen is produced in the microsporangium (contained in the anther of an angiosperm flower or male cone of a coniferous plant). Pollen grains come in a wide variety of shapes, sizes, and surface markings characteristic of the species (see photomicrograph at right). Most, but certainly not all, are spherical. Pollen grains of pines, firs, and spruces are winged. The smallest pollen grain, that of the Forget-me-not plant (Myosotis sp.), is around 6 ┬Ám (0.006 mm) in diameter.

Allergy to pollen is called hay fever. Generally pollens that cause allergies are those of anemophilous, because the lightweight pollen grains are produced in great quantities for wind dispersal. Breathing air containing these pollen grains brings them into contact with the nasal passages.


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