Give a detailed solution to the question provided:
 
Explain how plants excrete their gaseous waste products through simple biological processes.
 
Answer variants:
oxygen
carbon dioxide
diffusion
excretion
stomata
 
a. The process by which plants remove metabolic waste materials from their body is called
.
 
b. During cellular respiration, plants release
as a waste product.
 
c. During photosynthesis, plants release
as a by-product into the atmosphere.
 
d. The exchange of these gases takes place through small pores on the leaves known as
.