Here is the Homework for this week:
Read pages 40 -53 and answer the questions on page 43, 48 and 53.
Write up and pass in the lab we did today, Enzyme Activity in Plant and Animal Tissues.
Those taking the make up test, be prepared for next week.
Friday, November 14, 2008
Friday, November 7, 2008
Homework assigned on Nov. 7, due Nov. 14
Quiz Nov. 14th on Chapter 8, Photosynthesis.
Please read pg 34-43 and answer questions on pg39 and 43.
Write up the Cellular Respiration Lab we completed today.
Please read pg 34-43 and answer questions on pg39 and 43.
Write up the Cellular Respiration Lab we completed today.
Tuesday, November 4, 2008
Osmois in Elodea cells
Diffusion, Osmosis and Cell Membranes
Osmosis in Elodea Cells
Introduction
One of the functions of the cell membrane is to control the flow of materials into and
out of the cell. In this investigation, you will observe the effects of placing plant cells in
solutions of various concentrations.
Materials
Elodea leaves, microscope slides, cover slips, microscope, distilled water, tap water, 5%
salt solution, 10% salt solution, paper towel.
Methods
Prepare a wet mount of an Elodea leaf with tap water. Observe the leaf at 40X and
record your observations. Increase the magnification to 100X, observe, and record your
observations.
Remove the slide from the stage of the microscope. Place 2 drops of the 5% salt
solution on the slide at the edge of the cover slip. Tear off a small piece of paper towel
and place the torn edge on the slide at the edge of the cover slip that is opposite the side
where the salt solution was placed. The piece of towel should begin to soak up water,
drawing the salt solution under the cover slip as it does so.
Return the slide to the microscope stage and repeat the observations of the cells at 40X
and 100X. Record your observations. Repeat the above procedure. Record your
observations. Remove the slide from the stage, clean it and the cover slip, and put it
away. Put the microscope on low power and put it away.
Observations
Prepare sketches of a group of Elodea cells under each set of conditions. Label the
sketches to note the cell structures that you can identify. Be sure to note any changes in
the color, size, and shape of the cells. Make your sketches as accurate as possible.
Conclusions
Answer the following questions.
1. What is the shape of the typical Elodea cell?
2. What are the small green blobs found inside the cells? What is their
function?
3. What happens to the cells as the salt water flows under the cover slip?
4. What happens to the cells when the salt water is flushed out with
distilled water?
5. Elodea normally lives in fresh water. What changes would you observe
in the cells of an Elodea plant that was suddenly moved from fresh water to
salt water? Why?
Osmosis in Elodea Cells
Introduction
One of the functions of the cell membrane is to control the flow of materials into and
out of the cell. In this investigation, you will observe the effects of placing plant cells in
solutions of various concentrations.
Materials
Elodea leaves, microscope slides, cover slips, microscope, distilled water, tap water, 5%
salt solution, 10% salt solution, paper towel.
Methods
Prepare a wet mount of an Elodea leaf with tap water. Observe the leaf at 40X and
record your observations. Increase the magnification to 100X, observe, and record your
observations.
Remove the slide from the stage of the microscope. Place 2 drops of the 5% salt
solution on the slide at the edge of the cover slip. Tear off a small piece of paper towel
and place the torn edge on the slide at the edge of the cover slip that is opposite the side
where the salt solution was placed. The piece of towel should begin to soak up water,
drawing the salt solution under the cover slip as it does so.
Return the slide to the microscope stage and repeat the observations of the cells at 40X
and 100X. Record your observations. Repeat the above procedure. Record your
observations. Remove the slide from the stage, clean it and the cover slip, and put it
away. Put the microscope on low power and put it away.
Observations
Prepare sketches of a group of Elodea cells under each set of conditions. Label the
sketches to note the cell structures that you can identify. Be sure to note any changes in
the color, size, and shape of the cells. Make your sketches as accurate as possible.
Conclusions
Answer the following questions.
1. What is the shape of the typical Elodea cell?
2. What are the small green blobs found inside the cells? What is their
function?
3. What happens to the cells as the salt water flows under the cover slip?
4. What happens to the cells when the salt water is flushed out with
distilled water?
5. Elodea normally lives in fresh water. What changes would you observe
in the cells of an Elodea plant that was suddenly moved from fresh water to
salt water? Why?
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