Answer: Pollen from a plant is biotic factor and the pollution from oil refinery is abiotic factor.
Explanation: The pollen grain that is released from the plant is biotic factor as it has life and it is basically a living cell which can give life to a flower. The pollen grains fuse with egg cells to produce flower which is a living part of the ecosystem.
The pollution from a oil refinery is abiotic as it does not contains living organism in it. It can affect the life of living organism but it is a abiotic factor.