Plants take carbon dioxide for photosynthesis and they give out oxygen as it is not wanted by them and is a waste.
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i want in 50 lines
so you should write in the question only now there is no option for editing

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1.plants use carbon dioxide for the process of photosynthesis and give out oxygen as waste which we need for our survival.
2.when plants die and get mixed with soil they form humus which we use as manure.
more examples:- rubber and raisins are plants waste which are useful to us.
yeah correct
i know, thanks
i want still
so you should clarify in the question now i can't edit