BIOL 201 Lecture Notes - Lecture 1: Sorus, Sporangium, Fern
Document Summary
Fern life cycle o o o o o o o o o o o o o o o o o o o. Ferns have been admired for their beauty and have provided shelter. Some are small and some are big as trees. The familiar fern is known as a sporophyte. Sorus is on one side of fern (usually covered by a cap called indusium) Contains sac likes structures called sporangium which consists of protective jacket cells on outer layer. On other side of sporangium, lip cells form. Below jacket, there are two layers of cells called tapetum which nourish the fertile tissue within. Each sporocyte cell is diploid containing two sets of chromosomes, one from each parent. Cytoplasm undergoes cleavage which results in a tetrad. Tapetum breaks down depositing a very tough protective coat of. Each cell is now called a spore sporopollenin o. Opening of sporangia is accompanied by annulus as it begins to dry.
