Is it true that pollen grains have a tough protective coat that prevents them from drying up?

Pollen grains have a tough protective coat called the exine, which helps to prevent them from drying up and protects them from environmental stresses such as UV radiation and desiccation. The exine is composed of a complex polymer called sporopollenin. This tough outer layer helps to protect the delicate genetic material contained within the pollen grain, allowing it to survive for extended periods of time in a wide range of environmental conditions.