Palisade cells are the primary photosynthetic cells in plants, and they absorb light energy to perform photosynthesis.

Here's a breakdown:

* Light Energy: Palisade cells contain chloroplasts, which are the organelles responsible for photosynthesis. Chloroplasts contain chlorophyll, a pigment that absorbs light energy, primarily in the red and blue wavelengths.

* Photosynthesis: This absorbed light energy is used to power the process of photosynthesis, which converts carbon dioxide and water into glucose (sugar) and oxygen.

* Glucose: The glucose produced during photosynthesis is a source of chemical energy for the plant and can be used for growth, reproduction, and other metabolic processes.

So, while palisade cells need other forms of energy for cellular processes, the primary energy they absorb is light energy.