external image 1191100898_0682.jpg Welcome to the RHS CPBiology 2008/09 Giant Pumpkin Wikispace!!! external image pumpkin.jpg

Below is where you and your team (partners) will enter you information, images, videos, graph and/or images about your giant pumpkin topics (click here to see an example of a wiki from last year: http://rhsbiology.wikispaces.com). I will embed the rubrics and overview here later today. You'll also notice that your classmates have started to 'add pages' on the left of this page to guide away from this primary page (click here to see a nice example from some earth science kids: http://gwp.wikispaces.com/Factors).


Project Overview:

WIKI Rubric :

PSSST, you'll never grow a bigger pumpkin than Manka!!!

http://www.youtube.com/watch?v=_N1QIXGf0CU



Seed Germination and Flower Structure
By Cole Poosikian, Connor Shaw, Justin Roth, Danielle Sriqui

Seed Germination:
 The seed absorbs the water and then it will burst, making that the first sign of germination. This activates the enzymes, increases repiration and the plant cell gets duplicated. A chain of chemical changes starts which leads to development of plant embryo
 The stored chemichal energy in the form of starch is converted to sugar which will be used in the germination process. Soon the embryo gets enlarged and the seed coat bursts.
 The growing plant emerges. The tip of the root comes out first and helps to hold the seed in place. It also allows the embryo to absorb the minerals and the water from the soil.
 Some of the seeds require special temperature treatment, light or moisture to help kick start the germination process.
 The steps of seed germination can sometimes be different in dicots and monocots.

During the dicots germination process, the primary root comes out through the seed coat when the seed is buried in the soil. As it matures, it will be shaped like a hairpin, known as a hypocotyl arch. Epicotyl structures are protected by two cotyledons from any kind of damage. When the arch emerges, it becomes erect, which is caused from the light. The Cotyledons separate, exposing the epicytol which has the two main leaves and also has the apical meristem. In most dicots, the cotyledons supply food stores to the maturing plant and it also makes it green to make more food by photosynthesis.
The seed coat is the outer skin of the seed, protecting its embryo from any harm, parasitical entry, and keeps it alive. The seed coat can be thick, hard, thin, or soft. The endosperm acts as a temporary food source, which is kept around the embryo in the shape of cotyledons or seed leaves. Plants are classified as monocots and dicots depending upon number of cotyledons.


SeedGermination-dicot.jpg
Pumpkin Seed Structure


Flower Structure:
Female Flowers are easily identified. A tiny baby pumpkin is placed between the stem and the flower. The female flower will grow close to the vine and the stem only reaches a couple of inches long. In the middle is a multi segmented stigme which must be pollinated in order for the fruit to grow. The first picture above is an immature female. The second pic shows a mature female with her flower open and ready to be pollinated.
Male flowers are on a stem that is pretty thin and shoots up several inches to a foot above the vine. The center stamen contains the pollen. Pollen is grown if it readily comes off the stamen and onto someones finger. It should not be picked or used if it is not mature. There should be a mature male or two ready to pollinate whenever a female matures.


Flower-structure-median-longitudinal-section.jpg
Pumpkin Flower Structure