When an insect is feeding on a plant, which types of tissue are at work to protect the plant and it heal from injury?
sclerenchyma and collenchyma
parenchyma and collenchyma
vascular and dermal
ground and parenchyma

Vascular and Dermal

Dermal tissue in the plants serve as the  the first line of defense system to a physical damage which are mainly caused by insects, and infection.  It covers the outer side of the plants.

The vascular tissue in plants serve to transport water and nutrients to the plants  which are required by the plants for the activity of cells.

Example of vascular tissue: xylem and phloem

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

its temperature is increasing. this causes molecular vibrations to increase.