How have plants evolved to mimic insects when they don't have vision?
Evolution is more than meets the eye.
Asked by: Andrew Setchfield, Sheffield
The bee orchid has flowers that look like the females of a particular species of bee. When male bees are tricked into mating with them, they get covered in pollen and spread it from flower to flower. Clever as this seems, the bee orchid is oblivious. It can't see itself or the bee and doesn't have the nervous system needed to appreciate the similarity anyway. Luckily, it doesn't need to.
Evolution isn't steered by individuals. It just throws a lot of spaghetti at the walls and sees what sticks. The ancestor of the bee orchid probably relied on nectar to lure bees, just like other flowers. But then a random mutation happened to make one strain look slightly more inviting to bees than the other flowers. Over time, the flowers that looked most like female bees attracted more pollinators, even when they didn't bother producing much nectar. So they reproduced quicker with less effort. This is a slow process, but with a few million years and enough determined bees, you can get a lot done. Although to be fair, it still only looks vaguely like a bee, so it's a good thing that bees don't have great eyesight either!
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Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.
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