Question

what are the uses of pollen grain​

Answer 1

pollen analysis has become a standard tool: Government agencies analyze the pollen content of fake Viagra and other prescription drugs to determine where they came from. Museums use pollen to authenticate paintings by master artists. Oil companies study fossil pollen to locate hydrocarbon deposits. Archaeologists study pollen to learn how ancient human communities used plants, and even the seasons at which they occupied a particular site. And paleobotanists study pollen evidence to reconstruct former environments, thousands or even millions of years into the past.