Chapter 30 Plant Diversity ii The Evolution of Seed Plants

Nonvascular Seedless Vascular Seeded Vascular

Gymnosperms “Naked Seeds” – When you go to the gym, some people have minimum clothing on… Cycadophyta Known as ‘cycads’ Ginkgophyta Only one species exists: Ginkgo biloba Since there is only one species left, I remember this with the question “Where did its kin go?” (I know it’s a stretch but ‘kin go’ sounds like ‘ginkgo’ and the question implies that the species is alone….aww) Gnetophyta Used for medicinal purposes like ephedra – that’s so ‘neat’! (‘Gneto’ sounds like ‘neat’) Coniferophyta Conifers…duh

Practice the Pine Life Cycle

*Megaspore -> Mitosis -> Female Gametophyte (takes about 15 months to mature) -> Mitosis -> Egg °Pollen grain -> Mitosis -> Male Gametophyte (grows pollen tube, reaches female gametophyte in about 15 months) -> Discharges sperm nucleus to fertilize egg * * * ° ° ° ° I tried to remove/cover-up the labels that you didn’t need to know so that you could focus on the important ones!

Angiosperms Flowering Plants – “My friend Angie owns a flower and fruit shop”

Life Cycle of Angiosperm Note the Double Fertilization! Click on play button to play video

Practice!

What did the diagram that Dr. Cusic drew on the board mean? How those cells actually look like in the megaspore/embryo sac N N N N N N N N Egg N 2N Polar Nuclei Mitosis X 3

What did the diagram that Dr. Cusic drew on the board mean? Sperm N N 2N Egg + N Zygote N 2N Polar Nuclei + 3N N Endosperm Mitosis X 3

Monocots vs. Eudicots