Seed Advantages 1) Seed plants don’t depend on water to reproduce Pollen spread by wind and animals 2) Embryo has…. Nourishment: Nutrients inside feed embryo Protection: Hard shell 3) Seeds allow for dispersal Carried by wind, water, animals Wind Wind Wind Some seeds have “wings” Some seeds are carried by wind Some seeds are carried by animals
Group 3: Seed producing, Vascular Plants Type 1: Gymnosperms Needle-like leaves (reduces water loss) Common to lumber industry Seeds enclosed in cones Male cones: produce pollen Female cones: produce eggs Zygote hardens into seed (protected inside cones) Ex: Evergreen, Pine, Redwood, Cedar
Gymnosperm Life Cycle 1) Male and female seed cones grow on adult sporophytes Let’s zoom into the cones of this sporophyte tree. Male cones Female cone
2) Pollen (male gametophyte) released from the male seed cones. Female eggs become fertilized Zygote created inside the female cones Male cones make pollen Female cones make eggs egg zygote egg zygote egg zygote egg zygote
seed seed seed seed 3) Seeds begin to harden inside the female cones
4) Seeds often spread by wind “wing” helps seeds spread greater distance
5) Seed will land ground
Kobe Kuiz • Name three advantages of seeds. • Which structure will protect gymnosperm seeds? • What do male cones produce? • What do female cones produce? • What is created when the sperm and egg fuse: sporophyte or gametophyte?