ocr: PLANT ExCRETION REEN PLANTS respire (to obtain excrete oxygen (from photosynthesis) J energy) all the time, producing into the air. This oxygen is breathed carbon dioxide as a waste product. in by animals. Trees build up waste During the day, plants also carry and pass it to their leaves. When the out photosynthesis. While both leaves drop offin the fall, they take respiration and photosynthesis the waste with them. are: going on, carbon dioxide both from respiration and the air is Carbon used as the raw material for dioxide photosynthesis. Plants then Day and night DAY NIGHT During the day, p ...