Vascular Plants Flashcards
What are the orders of spermatopsida?
Gymnospermidae
Angiospermidae
What are the classes of vascular plants?
Pteropsida
Spermatopsida
Lycopodiopsida
What are the 4 sub groups of the gymnospermidae?
Cycads
Ginkgo
Conifers
Gnetophytes
What is the main characteristic of the cycads?
Their sporophytes are dioecious
They were eaten by dinosaurs
What are the main characteristics of the ginkgo?
Dioecious
Medicinal
What are the characteristics of conifers?
They have massive woody female cones
They have ephermeral, papery, small male cones
They have important roles in the paper and construction industry
What are the characteristics of the gnetophytes?
They have gnetum
Very similar to flowering plants but genetically close to pines
What are the characteristics of pteropsida?
Terminal paired sporangia
Euphylls
Ferns including horsetails
Spore dispersal
What are spermatopsidas?
Seed plants
What are seeds?
A fertilised ovule
What did the ovule evolve from?
The bracs fused
How do ferns dispers their spores?
Sporangium with annular thickening which acts like a spring. Drying causes the spine to reflex, on more drying it snaps back.
Is the protostele hollow?
No, it’s solod
Is the siphonostele solid?
No, it contains pith
Is the eustele solid?
No it is made of many tubes
