Which of the following has proved helpful in preserving pollen as fossils ?
(1)
Oil content
(2)
Cellulosic intine
(3)
Pollenkitt
(4)
Sporopollenin
Sporopollenin is one of the most resistant biological materials, found in the exine of pollen grains. It is resistant to microbial and chemical decomposition and due to this, pollen grains are well preserved during fossilisation.