* Plants DO need oxygen for cellular respiration. Cellular respiration is the process where plants (and all living things) break down food (glucose) to release energy. This process requires oxygen.

* Plants MAKE their own food through photosynthesis. Photosynthesis is the process where plants use sunlight, water, and carbon dioxide to produce glucose (their food) and release oxygen as a byproduct.

So, the key difference is:

* Photosynthesis: Plants use sunlight to make food (glucose) and release oxygen.

* Cellular Respiration: Plants use oxygen to break down glucose and release energy.

It's a bit of a cycle:

1. Plants make glucose through photosynthesis using sunlight.

2. Plants then use oxygen in cellular respiration to break down the glucose and get energy.

While plants do need oxygen to release energy, they are also the primary producers of oxygen on Earth.