<P> Plant defense against herbivory or host - plant resistance ( HPR ) describes a range of adaptations evolved by plants which improve their survival and reproduction by reducing the impact of herbivores . Plants can sense being touched , and they can use several strategies to defend against damage caused by herbivores . Many plants produce secondary metabolites , known as allelochemicals , that influence the behavior , growth , or survival of herbivores . These chemical defenses can act as repellents or toxins to herbivores , or reduce plant digestibility . </P>
<P> Plant defense against herbivory or host - plant resistance ( HPR ) describes a range of adaptations evolved by plants which improve their survival and reproduction by reducing the impact of herbivores . Plants can sense being touched , and they can use several strategies to defend against damage caused by herbivores . Many plants produce secondary metabolites , known as allelochemicals , that influence the behavior , growth , or survival of herbivores . These chemical defenses can act as repellents or toxins to herbivores , or reduce plant digestibility . </P>
how do some chemicals in plants protect them from their enemies
how do some chemicals in plants protect them from their enemies
repellents toxins reduce plant digestibility
repellents toxins reduce plant digestibility