What is the relationship between plants and oxygen? Responses Plants do not need oxygen because they do not undergo cellular respiration. Plants do not need oxygen because they do not undergo cellular respiration. Plants do not need oxygen because they use carbon dioxide in cellular respiration. Plants do not need oxygen because they use carbon dioxide in cellular respiration. Plants produce oxygen during photosynthesis, and they also need oxygen gas from the air for cellular respiration. Plants produce oxygen during photosynthesis, and they also need oxygen gas from the air for cellular respiration. Plants do not need oxygen from the air because they produce it during photosynthesis. , , Plants do not need oxygen from the air because they produce it during photosynthesis.,