Explain the procedure and observations of the experiment in which you observed cork cells?
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Background:
Over 300 years ago, Robert Hooke. an English scientist. described
the appearance of cork under the microscope. He named the tiny, box-
like structures he observed cells. Cork, which does not contain living
tissue. comes from the outer bark of the cork oak tree.
By the early part of the 19th century, it was accepted that all living
things are composed of cells. Cells come in a variety of shapes and
sizes, and they perform different functions. Although cells are different.
they resemble one another because they share certain common struc-
tures. The microscope reveals that most plant cells and animal cells
have various components including the nucleus, nucleolus, mitochon-
dria, cytoplasm, and cell membrane. An understanding of the cell is
essential to the study of biology.
Objectives:
In this activity you will:
1. Observe the structure of dead cork cells.
2. Observe the structure of living oniori cells.
3. Apply your knowledge of the operation of a microscope.
Materials:
i) microscope
ii) slides
iii) cover slips
iv) single-edged razor blade
v) medicine dropper
vi) water
vii) cork stopper
viii) onion
ix) forceps
x) Lugol"s iodine solution in dropper bottle
xi) paper towels
Procedures and Observations
PART I. CORK CELLS ----------------
To observe cork cells under a microscope, you must slice very thin
sections of cork.
1. Place the cork on a paper towel or on several sheets of paper.
Hold the cork firmly and shave a thin section from the cork With a razor blade. The slice must be paper-thin.
CAUTION: Razor blades are sharp! To avoid cutting your fingers, slice away from them, not toward them.
2. When you have cut a slice thin enough for light to pass through it, prepare a wet mount. Place the cork slice in a small drop of
water on a slide. Add another drop on top of the cork. Then cover it with a cover slip.
3. Examine the cork under low power. The best place to look is along the thinnest edge of the slice.
a. Make a drawing of what you see under low power.
4. Examine the cork under high power.
b. Describe the general shape of cork cells.
c. Draw several cork cells as they appear under high power and label
the cell wall.
HOPE IT HELPS
Over 300 years ago, Robert Hooke. an English scientist. described
the appearance of cork under the microscope. He named the tiny, box-
like structures he observed cells. Cork, which does not contain living
tissue. comes from the outer bark of the cork oak tree.
By the early part of the 19th century, it was accepted that all living
things are composed of cells. Cells come in a variety of shapes and
sizes, and they perform different functions. Although cells are different.
they resemble one another because they share certain common struc-
tures. The microscope reveals that most plant cells and animal cells
have various components including the nucleus, nucleolus, mitochon-
dria, cytoplasm, and cell membrane. An understanding of the cell is
essential to the study of biology.
Objectives:
In this activity you will:
1. Observe the structure of dead cork cells.
2. Observe the structure of living oniori cells.
3. Apply your knowledge of the operation of a microscope.
Materials:
i) microscope
ii) slides
iii) cover slips
iv) single-edged razor blade
v) medicine dropper
vi) water
vii) cork stopper
viii) onion
ix) forceps
x) Lugol"s iodine solution in dropper bottle
xi) paper towels
Procedures and Observations
PART I. CORK CELLS ----------------
To observe cork cells under a microscope, you must slice very thin
sections of cork.
1. Place the cork on a paper towel or on several sheets of paper.
Hold the cork firmly and shave a thin section from the cork With a razor blade. The slice must be paper-thin.
CAUTION: Razor blades are sharp! To avoid cutting your fingers, slice away from them, not toward them.
2. When you have cut a slice thin enough for light to pass through it, prepare a wet mount. Place the cork slice in a small drop of
water on a slide. Add another drop on top of the cork. Then cover it with a cover slip.
3. Examine the cork under low power. The best place to look is along the thinnest edge of the slice.
a. Make a drawing of what you see under low power.
4. Examine the cork under high power.
b. Describe the general shape of cork cells.
c. Draw several cork cells as they appear under high power and label
the cell wall.
HOPE IT HELPS
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