Monthly Archives: November 2010

Flowers

Today we looked at the flower of the fuchsia plant and the different parts of the flower such as the reproduction parts like the stigma and the stamen. After that we looked at how the flower reproduces and what pollinates the flower, eg. wind, insects etc.

Transpiration

During class we have been learning about the structure of  plant stems, their components and what their part is in allowing the plant to survive. Today we have been looking at a cross-section of a plant stem under a microscope and identifying the xylem and phloem.

Below: Dougal at the microscope

Above: The cross section of a stem

Squid Disection

Today we learnt about fish and watch a documentury on giant squid.Then we disected squid it was mildly facinating lesson with Slug getting right into it.

Measuring Photosynthesis

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.

Dean Experiencing The Magic Of Science

Agapanthas and puka leaf

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.

Starch Test

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.

Leaf with Starch, Meths it was boiled in

Ecology

today in truckers class were learning about ecology and were talking about the reproduction of a dogfish, and bacteria, when bacteria reproduce they split into two and could possibly have millions in one day. we had a competiton to make the best graph and the winnner got a chocolate bar, all tim did was sneakily text kaula.

Potato plastic

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.

Dogfish dissection

We dissected Dogfish, Squalus acanthius. Mr Riley got in big trouble for stinking out the school before prizegiving assembly!