We are shaking a baby to work out how much shaking can cause brain damage.
Our aim today was to measure the effect of ligh intensity on photosynthesis. We set up a light system and put waterweed plants in a test tube upside down with water and sodium carbonate. Then we measured the distance from the test tube to the light and how many bubbles came from the plant in a minute. Then we changed the distance and repeated this. This shows effects on photosynthesis by light because plants produce oxygen when they perform photosynthesis, these are the bubbles.
Today in Mr Rileys awesome as science class we looked at agapanthus and puka leaves through microscopes. Our goal was too explain the structure of leaves. Through the microscope we were trying to look at a cross section in the leave too find the different cell layers, the cross layer, the epidermis, the palisade layer (where photosynthesis goes on) the spongy layer and the contracting and expanding Guard cells or toma which control the entry of c02 and exit of gases such as O2 and H2O.
Here were some questions we were asked afterwards about the plants.
What is a stoma? The stoma is the tiny hole to allow gases in and out the leaf.
What does the word stomata mean? The plural of stomata.
Why does a plant need a stomata? To exchange gases and allow photosynthesis to happen.
Today we did a starch test on Maple leaves. First we put the leaves in boiling water, then we put them in methelated spirits until they go white. Next, we put some iodine on them and if they turn black they have starch present.
We crushed potato in mortar and pestle, then washed out the starch and filtered it. We added some chemicals and boiled it to make potato plastic.
Today in Mr Riley’s Science class we built miniature Bailey Bridges. Bailey Bridges are the bridges that the allied forces used in WW2 when the allied forces were retaking Europe and the Axis were destroying the bridges. They used bailey bridges because they were quick too build. We had 2 teams, each of half the class. The goal was to bridge the gap over two desks well enough for the smallest team member too walk over.
Here are some pictures of bailey bridges