That statement is not entirely accurate. While plants primarily perform photosynthesis and animals primarily perform cellular respiration, both processes happen in both plants and animals.

Here's why:

* Photosynthesis: This process converts light energy into chemical energy, primarily in the form of glucose. It is essential for plants to produce their own food. While animals cannot perform photosynthesis themselves, they rely on plants for the glucose produced through this process.

* Cellular Respiration: This process breaks down glucose to release energy in the form of ATP. This energy is crucial for all living organisms, including plants and animals, to carry out their life functions.

In summary:

* Plants: Perform both photosynthesis and cellular respiration. They use photosynthesis to create their own food and cellular respiration to use that food for energy.

* Animals: Do not perform photosynthesis but rely on plants for glucose. They perform cellular respiration to break down the glucose for energy.

Therefore, both plants and animals need both photosynthesis and cellular respiration to survive. They just rely on different sources for the glucose needed in cellular respiration.