Question

why are weeds and wild plants not affected by insects or pests

Answer 1

1) Weeds and wild plants produce waste products which are stored in leaves, bark and fruits.
2) Several compounds are synthesized by weeds and wild plants for their own use especially for defence.
3) Several weed and wild plants prepare chemicals and store them in different parts for protection against herbivores, insects and pests.
4) Most of these chemicals are unpleasant to taste and hence insects and pests do not prefer to eat such plants. •
5) Some of the chemicals are toxic and may even kill the insects and pests that eat them.
6) Hence,weeds and wild plants are not affected by insects and pests.

Answer 2

Answer:

Weeds and wild plants can be affected by pests, such as insects. However many wild plants have a natural resistance, or resilience against predators, which they have gained through years of natural selection and adaption.  

Wild plants protect themselves in the following ways:

1.    Plants produce chemicals which repel or poison insects.

2.    Plants produce chemicals designed to reduce palatability.

3.    Plants have a thick waxy cuticle covering soft tissues, such a leaves, which acts as a physical barrier against predation.

Explanation: