CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY. CLAUDE NURIDSANY & MARIE PERENNOU / SCIENCE PHOTO LIBRARY.
Fly (Syrpha) made prisoner by the leaf of the carnivorous plant Drosera rotundifolia, the sundew. The fly is attracted by the glistening droplets at the tips of the tentacles, which extend from the leaf surface. The tentacles are of two kinds; longer marginal ones & shorter inner ones. Insects stick to the tips of the longer ones, which bend over bringing them inward towards the shorter ones. Proteolytic enzymes secreted by the tentacles digest the insect & the products are absorbed by the leaf. Drosera grows in a nitrogen deficient environment (bogs), which it overcomes through a carnivorous diet.
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