The toxin released by Cassava roots is an example of a chemical defense against herbivores.
Allelochemicals, secondary metabolites produced by many plants, have an impact on the behavior, growth, or survival of herbivores. Cassava is one such plant that releases the toxin hydrogen cyanide when the roots are digested.
Due to the toxins in the plants and tubers that are harmful to humans, processing cassava takes a long time before it can be eaten safely. These poisons are cyanogenic glucosides, which when tissues are crushed release cyanide gas. The compounds that contain cyanide are found in high concentrations in the leaves. They are then transported to the tubers, where they are likely to serve as a pest repellent, a nitrogen source for the roots, and a danger to herbivores.
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