Tuesday, March 13, 2012

March 13, 2012

Today We:
Measured our plants (if you missed today, get the data from your partner)
Took a quiz on Chapter 16
Completed Chapter 28 Notes
Watched a video on plants in the rainforest
Plant Growth (a bit of review):
Primary growth: lengthening
  1. Cell division- mitosis at apical meristem region
  2. Elongation- root gows longer
  3. Maturation- root hairs develop
At the very end of the meristem ther is a root cap, which protects the area of the meristem going through rapid mitotic growth.
Secondary Growth: thickening
Vascular Cambium: Arranges vasdcular bundles and gives rise to secondary phloem and xylem.
Cork Cambium: Produces cork, which is dead when mature (aka bark) and protects the stem.
How Secondary growth works: To survive, the plant must produce xylem and phloem. Xylem is on the inside of the vascular cambium (closer to the center), and phloem is on the outside. This first set of xylem and phloem is primary xylem and primary phloem. When this vascular tissue becomes old, new tissue must replace it. The vascular cambium makes a second set of vascular tissue, or secondary xylem and secondary phloem, which is now the closest set of tissue to the vascular cambium. The alive, secondary tissue (produced second) pushes the primary xylem further in, and the primary phloem further out. The phloem pushing against the cork causes it to crack, resulting in rough bark.
Why shouldn't we peel bark off trees?: Then, you are ripping off a layer of phloem, the life source for the trees. Basically, you're a tree killer.
Pollinators (vectors) Have a Mutualistic Relationship with Flowers!
1. Pollenation- the chances of fertilization, and the formation of a seed, is greatly increased
2. Seed dispersal- seeds are taken away to colonize new environments with mre resources
Pollinators: They get food!
1. Bees are attracted by scent
2. Birds are attracted by red and pink petals
Homework: Work on the project, read UP 41-54


  1. I think that you did a good job of simplifying many of the terms so they are easier to understand. The picture is pretty helpful as well, and the Lorax picture was clever. Nicely done!

  2. I agree with what Austin said. The notes that we took in class were kind of hard for me to sort through and your summary really simplified and helped me better understand the concepts we learned. Awesome post!

  3. the notes helped a lot, but the picture of the lorax seemed irrelevent. what was the connection?

    1. He speaks for the trees! So dont be a bark pulling, phloem ripping TREE KILLER! Plus, the lorax is a personal hero of mine so I just stuck him in the middle of my post in all his semi-relevant glory =D

  4. I liked your picture of the Lorax and I agree that you made everything seem pretty simple, which was helpful because I was confused in class.