How many sperm cells fertilize the egg in angiosperms?
one b) two c) two sperm cells and a tube cell nucleus d) it is hard to say because angiosperms have a free state nucleus e) None of the above is correct because the egg engulfs the sperm cells 4. Recently discovered fossils originating from the time when land flora most likely consisted of Bryophytes are very similar to modern day heterotrophic, mycorrhizal symbionts. This discovery suggests that • the plants may have been infected by pathogens • the fungi may have participated in the Bryophyte invasion of the terrestrial environment • algae and fungi formed mycorrhizal symbioses • fungi and Bryophytes formed lichen symbioses • lichen symbiosis emerged concurrently with the Bryophyte invasion of the terrestrial environment 5. Woody plants are long-lived. This long life span results in great quantities of secondary (waste) metabolites that need to be dealt with. How? • woody plants use their excretory and circulatory systems to clean the wastes • vacuoles excrete the wastes • vacuoles a
