Saturday, March 12, 2011

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

II. Ferns
  • 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
III. Gymnosperms
  • 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
  1. contains sperm
  2. wind carries it
  3. evolution of seeds
  • lack ovaries so seeds are naked
  • seeds germinates under favorable conditions only
  • 2 types of cones
  1. Female cone is hard, woody, and more familiar (pinecones)
  2. Male cone is smaller, releases millions of pollen grains. Wind blows it.
  3. 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
  1. Sepals- green, enclose flower before is opens up
  2. petals- these are th parts that attract the insects
  3. stamen- have filaments that bears a sac called the anther. Anther is a MALE organ that develops the pollen grains
  4. 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!
Angiosperms life cycle
  • 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

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