Question

Hey guys ! Answer

the exine can save the pollen grain from the acidic,basic or any other harmful enzyme . But it is absent at the GERM PORE , what will happen if the spore is kept in Acid or base ! can the spore survive or die because acid can enter into the spore from germ pore !​

Answer 1

Answer:

Wall of a pollen grain consists of two layers-outer exine and inner intine. Exine is the hard outer layer which is made up of sporopollenin. Sporopollenin is one of the most resistant organic material known. It can withstand high temperature, strong acid or alkali and is not degraded by enzymes. Because of the presence of sporopollenin, pollen grains are well preserved as fossils. At certain places the exine is thin or absent, these areas may have thickened intine of deposition of callose. They are called germ pores(if rounded) or germinal furrows(if elongated). Sporopollenin is absent in the region of germ pores or germinal furrows.