(A) The pollen grain wall consists of two layers: the outer layer called the $Exine$ and the inner layer called the $Intine$.$Exine$ is made of sporop

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(A) The pollen grain wall consists of two layers: the outer layer called the $Exine$ and the inner layer called the $Intine$.$Exine$ is made of sporopollenin,which is highly resistant to degradation.At certain places,the $Exine$ layer is thin or absent; these specific sites are known as germ pores.Therefore,germ pores are found only on the $Exine$ layer.