Gymnosperms Flashcards
What is common to all seed plants?
- Seeds
- Reduced gametophytes
- Heterosporous
- Ovules
- Pollen
What are the 3 parts of a seed??
A. Embryo
B. Food supply
C. Protective coat surrounding embryo
What do megasporangium produce?
Mega spores or female gametophytes
What microsporangium produce??
Microspores or make gametophytes
What does the ovule consist of?
- Megasporangium
- Megaspores
- One or more integuments
What do pollen grains consist of?
- Pollen wall
2. Male gametophytes
What is pollination?
Transfer of pollen to the part containing ovules
What is the micropyle?
Opening in the ovule, where the sperm enters
What does a megaspore develop into?
Multicellular female gametophyte
What do ovaries and ovules develop into?
A. Ovule to seed
B. Ovary to fruit
What do integuments develop into?
Seed coat
What are the 4 phyla of gymnosperms?
- Cycadophyta- cycads
- Ginkgophyta- ginkgo biloba
- Gnetophyta- ephedra
- Coniferophyta
A. Largest of gymnosperm
B. Evergreens
C. Carry out photosynthesis year round
What is the life cycle of gymnosperms??
A. Dominance of sporophyte generation
B. Development of seeds from fertilized ovules
C. Transfer of speed to ovules by pollen
What does gymnosperm mean?
Gymno = naked
“Naked” seeds - not enclosed by ovaries
Where are the reproductive parts on a gymnosperm?
In the cones
