True or false? plants do not produce many defenses against pathogens unless they are threatened because defensive structures and compounds require much energy and materials to produce and maintain.

The answer would be true. 

Because the processes that produce defense against certain pathogens require lots of energy and resource, it is considered virtually a last resort, left for when they are threatened. 

Hope I could help!

Mg is used to measure mass

Ibelieve is d but i’m not 100% sure