Plants can produce the respiratory poison cyanide without poisoning themselves because plants

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Plants have evolved a mechanism to produce a cyanide precursor in one compartment, usually the cytosol, and activating enzymes in another compartment, usually the mitochondria. This allows them to produce cyanide without poisoning themselves since the precursor and activating enzymes do not come into contact with each other. This is known as compartmentalization.

Plants Can Produce the Respiratory Poison Cyanide Without Poisoning Themselves