Seed-Bearing Plants Flashcards
What are the evolutionary advances
Pollen grains and resistant seeds
What are pollen grains
They are produced from microspores, contain male gametes and DO NOT need water
What does a pollen grain develop into
A pollen tube
What is a seed
Embryonic plant, food storage tissue, hardened protective coat
What does a seed allow a plant to do
Allows the embryo to lie dormant until suitable growing conditions
What is the difference between a seed-bearing plant and a lower plant
1) The gametes of seed bearing plants do not depend on water for fertilization
2) The spores of seed plants are either male or female ie. heterosporous
What are common features of seed plants
They have a plant body and vascular tissue
What is a resistant seed
A seed that allows the plant embryo to lie dormant and contains food for initial rapid growth of the embryo
What are gymnosperms
Cone-bearing plants
When did gymnosperms occur
During dinosaurs
What the the leaves of gymnosperms like
Needle-like leaves with a single vein
What are unique characteristics of gymnosperms
- Sporangia
- Xylem only has tracheids no vessel elements
How are gumbo sperms Heterosporous
The female cones produce megaspores and the male cones produce microspores
True or false: Gymnosperms produce naked seeds
True
How is the embryo of gymnosperms protected against dedication
It is stored inside the seed
