March 11, 2011
Today we started off the day by watering our Wild plants. We watered them good for the weekend.
Next we moved on to notes.
Moss-Antheridium is the male gametophyte
- very diverse and most live in the tropics and temperate woodlands.
- Started to have vascular tissue
- Sperm are still flagellated (STILL NEED WATER!)
- Still seedless- have spores
- Sporophytes are diploid and gametophytes are haploid
- Sporophyte is the dominant stage
- heart shaped gametophyte is Prothallus
- cone-bearing plants (conifers)
- Withstand harsh winter
- Tallest, oldest, largest
- needle shaped leaves
- have thick cuticle and stomata in pits to prevent water loss
- wood- vascular tissue with liginin
- more sporophyte generation, gametophytes live in cones
- have pollen (male gametophyte
- contains sperm
- wind carries it
- evolution of seeds
- lack ovaries so seeds are naked
- seeds germinates under favorable conditions only
- 2 types of cones
- Female cone is hard, woody, and more familiar (pinecones)
- Male cone is smaller, releases millions of pollen grains. Wind blows it.
- Advantage is more genetic variation
IV. Angiosperms- flowering plants
- supply food, textile, some lumber
- refined vascular tissue
- evolution of flowers- responsible for unparalleled success
- the flowers display male and female parts
- insects transfer pollen. Advantage of this is there is a higher chance of pollenation
- Flower has Sepals, petals, stamens, and carpals
- Sepals- green, enclose flower before is opens up
- petals- these are th parts that attract the insects
- stamen- have filaments that bears a sac called the anther. Anther is a MALE organ that develops the pollen grains
- Carpel- also known as pistil. has a sticky tip called the stigma that traps the pollen. Has a style and an ovary. A chamber containing one or more ovules. This is where the egg develops!
- Sporophyte is a familiar plant- female gametophyte within the ovule, and th emale gametophyte is the pollen
- pollen lands on stigma, tube goes to the ovule. It deposits 2 sperm nuclei. Double fertalization
- one sperm cell fertilizes. This becomes a zygote and then an embryo.
- the other cell becomes nutrient for the embryo- storing tissue is called the endosperm
- Embryo has food within the ovule
- Ovule develops into a seed. THE SEED IS NOT NAKED
- Fruit: ripened ovary of the flower
- Fruit protects and helps disperse seeds.
- Animals help to disperse the seeds
- All fruit and vegetables crops are angiosperms.
This is the end of the notes we took. Next we watched a Life video.
HW: Read Chapter 28, work on projects
next scribe is Care Bear