Question

What are the various ways of excretion by plant? Name any two waste products of plant that are
useful to humans.

Answer 1

Elimination of toxic and waste products from the body is called excretion.

Plants produce two gaseous waste products i.e. oxygen during photosynthesis and carbon dioxide during respiration. Excretion of gaseous waste in plants takes place through stomatal pores on leaves. Oxygen released during photosynthesis is used for respiration while carbon dioxide released during respiration is used for photosynthesis.

Answer 2

plants excret waste as falling of leaves, bark,gum,it also excret  oxygen which is very use full to humans examples gum,latex,resins,rubber.
latex is used for leather making.
rubber is used in many ways.