Explain in brief : Exchange of gases in animals and plants

dear yamuna 
your query are not clear , i think u want to know about the respiration process in animal and plants . 
then its too lengthy to explain the whole process here . 
just read the study material avaliable on our website , and in case u have doubt in any cycle understanding , then let me know , i will explain that here . 
plant respiration involves so many cycles , like glycolysis , kerbs , and ETC , 
hope u got it 
regards