BIOL 1902 Lecture Notes - Lecture 19: Cirsium Vulgare, Gynoecium, Stamen
11 Apr 2016
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Unusual colour variation on red-breasted nuthatch = melanistic. Melanism: more common in mammals than birds. Chemicals used to attract mates = pheromones. Flowers = sex machines e. g. bladder campion. Flower sex organs: stamens = male (anthers = head on top); produce sperm, sex pistil = (female) produce eggs; has 3 parts: Stigma (big part) receiver of sperm. Yes but not this structure *image of jack-in-the-pulpit in lecture slide* Spot the flower"s penis : *image in lecture slide* Can"t walk around to deposit pollen grains in another plant. How to get pollen grains near eggs: insects, wind. One way is to harness the power of the wind: Meadow made by sedges = sedge meadow. Wind can be going almost anywhere; no guarantee that pollen will land on right target: solution: Very few plants use the power of moving water: Rare; usually in lake-based areas, lake-based plants. Majority of pants use this way to transport pollen.
