Question

Plants wastes are useful for human beings. Explain?

Answer 1

yes.it's really use full for human beings.
as,
  fire wood
  compost.
  wood
   and produce  raw materials for other productions.(tyers-rubber)
   
  

Answer 2

Plant wastes are indeed helpful to humans
1.)plants produce oxygen as a waste material which is helpful to us 
2.)it produces fruits from th extra starch material we need it
3.)it precipitates the excess water which turns in to clouds which give rain fall