Plant Reproduction: Seed Plants
Table of Contents DateAssignmentVocabularyPage 11/28/12Seed Plants10
Review- What are the two main types of plants? Non- Vascular – Lacking vascular tissue – Live in moist areas – Examples- mosses, liverworts, hornworts Vascular – Have vascular tissue to move water and nutrients through – Two types: seedless and seed plants
How is it all related? Have spores Have seeds
Brain Pop- Seed Plants As you watch the video, listen for the characteristics of each type of seed plant.
Set up your page like this… GymnospermsAngiosperms
Seed Plants Seed plants reproduce sexually – Fertilization from male and female sex cells Two types: – Gymnosperms E.g. Pine trees with cones – Angiosperms E.g. Most have flowers
Gymnosperms Means ‘naked seed’ = needs the cone to protect it! Cones are the reproductive structures on gymnosperms and each species has a different type of cone Male and female cones are produced on the same plant: – Female cones have ovules, which contain the egg cells – Male cones develop pollen grains, which contain sperm cells
Gymnosperms continued… Male cones release a cloud of pollen Wind usually carries the pollen to the female cone The pollen is trapped by a sticky substance and develops into a pollen tube – Grows towards the ovule and sperm can fertilize the egg cell – Can take 15 months!
Gymnosperms…there’s more! After fertilization, an embryo forms and develops into a seed When female pine cones mature, they open and release their seeds – These can be carried away, or are eaten or buried by animals Buried seeds may grow into new pine trees!
Angiosperms All produce flowers Can be brightly colored or have a nice smell to attract animals – Animals like birds (hummingbirds) or insects (bees) can help spread pollen to other flowers When pollen from the stamen lands on the stigma, this is called pollination – The same process occurs in gymnosperms, where a pollen tube grows into the ovule and eventually a seed will develop)
Angiosperm or Gymnosperm?
Angiosperm or Gymnosperm?