Blog designed for my science students but also open to anyone interested in basic experimental science. A place to read more about science, go over the experiments we do in the class, read about new and old science discoveries, publish your topics and projects and lots more.
Arturo Pérez E2A has brought a freshwater lobster to the class. He caught it in the River Pudio very near school. The crayfish is an invertebrate, arthropod and crustacean. It resembles a small lobster. It lives in rivers and streams that do not freeze to the bottom. They don't usually tolerate polluted water.
Freshwater lobster have two main body parts, the cephalothorax and the abdomen.
Check out this link that Guillermo Repetto has found for more information:
Plants absorb water and mineral salts through xylem vessels. After photosynthesis occurs in the leaves the elaborated sap is transported to other parts of the plant through phloem vessels.
We did an experiment to see how raw sap goes up the stem. We had various hypothesis, one was that the raw sap went up the whole stem, evenly. Others thought that the water went up specific tubes designed for this purpose, but we wanted to know where these tubes are located? Some thought there was probably only one in the centre, others,that there could be more than one and many ideas of the possible distribution of these vessels in the stem arose.
We used celery for this experiment. We put the stems in water and blue ink. After a few hours we could easily see the xylem vessels. In this case, we saw that there are many xylem vessels and they have a linear distribution on one side of the stem.
We cut the top of the stem to see them better and represented them in our experiment books.
Here are some photos of the experiment.
The horse shoe whip snake is very common in the south of Spain and are often found on our school grounds. Once again the maintenace workers have found one and have brought it to our laboratory for us to look after and to observe its anatomy and behaviour.
We need to find small lizards to feed him otherwise in a few days we will let him free.