HAPPY HALLOWEEN!!
Science 8/10
Please see Mr.Wenzel (Student Teacher)
Biology 12
From last class...this is where your journal should be today...
Please ask students to weigh
the original egg (remove the egg from vinegar carefully, blot dry with
paper towel and use electronic scales to record mass). Record mass and draw egg
in journals. Ask students to transfer eggs to EITHER a beaker with water or
syrup (stir the syrup before pouring). There should be three eggs for each - a
total of 6 eggs. They need to label their beaker with a group name and cover
with plastic wrap (with the potato lab materials). My previous class placed
their beakers on top of the filing cabinets – this class can do the same. We
will complete the observations next day.
Water potential:
There are notes available in the introduction of the lab. The following figures can also aid in understanding of Diffusion & Osmosis. We will be reviewing types of transports in more depth next class.
This is how you should lay out your Osmosis/Water Potential page...
This is how you should lay out your Osmosis/Water Potential page...
Students should work in groups of 3-4
Procedure:
1. Place approx. 10ml of
each solution (and water) into 6 different test tubes. The solutions are colour
coded, but should still be labelled. (***students need to clean the graduated
cylinders and/or beakers after each use & to use a beaker to pour the
solutions into the test tubes. Contaminated equipment will greatly influence
results)
2. Use a cork borer (approx.
5mm in inner diameter) to cut 6 potato cylinders of similar size. Do not
include any skin on the cylinders.
3. Determine the mass of
each cylinder. Record the mass of each in Table 1.4. Put each cylinder into one
of the sucrose solutions. (**Remind students to be careful with recording the
precise mass of each cylinder and track which test tube they are being placed
in. Inaccurate record keeping will greatly influence results)
4. Cover the beakers
with plastic wrap. Label the test tube rack with the group name and set aside
on the back counter.
Work on journal pages (ask students to add
information about proteins attached to the cell membrane, permeability,
diffusion & osmosis)
These are the next pages to start... (glitter is available on the shelf)
.jpg)
These are the next pages to start... (glitter is available on the shelf)
Homework - work on
journal pages & egg lab conclusion (to be collected next class)
Important notices…
Cell structures &
functions/Cell Membrane Quiz scheduled on November 6th/7th
Review class (come with questions!) on November 10th/11th
TERM TEST scheduled
on November 13th/14th
