Seed Plants
Mr. Skirbst
Seed Plants
Seed Plants
- Do not require standing water
to reproduce
Seed Plants
- Do not require standing water
to reproduce
- Encase young plants to protect
& feed
Seed Structure
Consists of:
1- seed coat
2- young plant
(embryo)
3- stored food
(cotyledon)
Cotyledon
Monocot – one cotyledon
Dicot – two cotyledons
Cotyledon
Monocot: petals multiples of 3
Dicot: petals multiples of 4 or 5
Monocot or Dicot?
Reproductive Structures
ovule -
Reproductive Structures
ovule – female structure
containing egg cells
pollen -
Reproductive Structures
ovule – female structure
containing egg cells
pollen – male structure
containing sperm cells
(often with spikes on surface)
Types of Plants
gymnosperms -
Types of Plants
gymnosperms – “naked” seeds
(not covered by ovary)
Types of Plants
gymnosperms – “naked” seeds
(not covered by ovary)
cones – location of
reproductive structure
(ex. Pine trees)
Types of Plants
angiosperms– seed contained in
“vessel”
(seeds covered by ovary)
Types of Plants
angiosperms– seed contained in
“vessel”
(seeds covered by ovary)
flowers – location of
reproductive structures
(a.k.a. flowering plants)
Gymnosperms
4 phyla:
Gymnosperms
4 phyla:
1- cycads – tropical, palmlike
Gymnosperms
4 phyla:
1- cycads – tropical, palmlike
2- ginkoes – ornamental (seeds
stink!)
Gymnosperms
4 phyla:
1- cycads – tropical, palmlike
2- ginkoes – ornamental
3- conifers – cone-bearing,
evergreen (like pine)
Gymnosperms
4 phyla:
1- cycads – tropical, palmlike
2- ginkoes – ornamental
3- conifers – cone-bearing
4- gnetophytes – blended
characteristics of gymno & angiosperms
Angiosperms
- Largest plant group in the
world
Angiosperms
- Largest plant group in the
world
- Also called “flowering” plants
Flowers
- Contain the reproductive
organs
Flowers
- Stamen (male)
Flowers
- Pistil (female)
Tropism
- A plant’s response to a stimulus
Tropism
- A plant’s response to a stimulus
Response – a reaction to a
stimulus
Tropism
- A plant’s response to a stimulus
Response – a reaction to a
stimulus
Stimulus – something causing a
reaction
2 Types of Tropism
1- Phototropism -
2 Types of Tropism
1- Phototropism – a plant’s
response to light
2 Types of Tropism
2- Gravitropism -
2 Types of Tropism
2- Gravitropism – a plant’s
response to gravity
Tropism
Positive tropism – response
toward a stimulus
Tropism
Positive tropism – response
toward a stimulus
Negative tropism – response
away from a stimulus