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Sporopollenin is the hard organic material that makes up the outer layer, that is, the exine of the pollen grain. 
The germ pores are apertures in the exine layer of the pollen grain where the sporopollenin is absent. The germ pore helps in the formation of the pollen tube and the release of the male gametes during fertilisation. The lack of sporopollenin in germ pores of exine layer allows the formation of pollen tube. 

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