BIO 3102 Study Guide - Karyogamy, Hemimetabolism, Tums
Document Summary
In the ocean: survivors represent same phyla as seen before (ex. molluscs, echinoderms, sharks). The biggest changes are the plants in terrestrial environment. Will start raising the oxygen levels in the atmosphere. 1st had green algae where sperm swam to egg. Then had bryophytes (mosses) start to see gametophyte supporting the sporophyte. In the ferns, see one green plant that undergoes metamorphosis on its own. Next will come the gymnosperms where a case for the sperm is made (pollen) which will move through the air to fertilize. Started with the ferns which had cell connections between cells that grew end on end on end called plasma-desmata . The cells are supported by lignin and are hollow and connected by opening between them. They connect directly to the leaves and directly to the roots. This becomes the water transport system of the plant.
