BIO 200 Lecture Notes - Lecture 15: Pollen Tube, Sporangium, Megaspore

• School: University at Buffalo
• Department: Biological Sciences
• Course: BIO 200
• Professor: All

Document Summary

Seed plants: gymnosperms: seed is important advancement, gymnosperms have naked seeds, gymno life cycle, 4 groups gymno. Seed= plant embryo protected by 2 layers tissue [extreme embryophytic dev] 3 ways seeds are adaptive: embyophytic, dispersal: hard seed coat lets embryo scatter from mother plant, dormancy: internal food source allows delay b/t dev & dispersal/dispersal. & sprouting; up survival chance b/c can pick best time to sprout. Homospory vs heterospory: homospory: when sporo prod single type of spore. Key trait of moss + ferns: heterospory: when mature sporo prod 2 diff types of spore (fem megaspore/ male microspore) Embryo dev inside tissue of megasporangium inside integument. Whole seed disperses and will germinate into mature sporo if lucky. All seed plants= dispersal/dormancy; heterosporous; red of gameto; sporo dom. Why aren"t seed plants dep on h20: bc no need for h20 for reprod w: seed, pollen grain, pollen tube.