Monthly Archives: September 2011

Osmosis with slices of potato

We sliced up potato and put the slices in 3 cups. In cup 1 was salty water, in cuop 2 was fresh water, in cup 3 was sugar wtaer. In fresh water the potato went harder. In salt and sugar water the potato went softer. Because of osmosis.

Potato Plastic

We made potato plastic, like the potato plate you can eat. we ground up the potato in a mortar and pesle. Then we boiled the starch with Hcl acid and glycerol. Then we had to neutralise the acid so the indicating paper was not red or blue. We poured it into a dish and it set into plastic.

Starch testing leaves

We tested for starch by boiling the leaf, then boiling it in meths, then adding iodine.

Dan and Blayr

Today we looked up close at leaves! There is a part of a leaf called a cuticle, It is waxy and keeps the leaf  damp. Then there is a part called the upper Epidermis, It is used for protection. After that there is a Palisade layer, this is where Photosyntheses happens. It is full of Chloroplasts which contains Chlorophyll. Then there is a spongy layer full of air gaps to let in Co2 + H20 and let out O2 + H20 out. Then Finally the Lower Epidermis that has tine holes called Stomata in the bottom.

Food tests!

We tested for starch, glucose, protein and fat.