What are some ways in which plants defend themselves from herbivores? describe two physical defense and two chemical defenses?

Plants have developed many defenses against herbivore, varying from the complex to the simple. Coconut palms and many oak nut trees preserve their roots by surrounding them in layers of woody or tough tissue which are hard to get through.

Physical defenses, which are mostly constitutive lead more to the apparent side; for example, thorns and ridges have developed in several groups as protection from herbivores.

Chemical defenses may be constitutive or persuaded, indicating that they develop or strengthen when herbivore is identified by the plant. Many elements are simply strong tasting, such as the lubricants which generate their heat or the sour tasting tannin present in several plant families.

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.