Explain what happened to the lettuce leaves after being placed into various beakers or cups.
2. What can go into and out of a lettuce leaf?
3. What happened when a lettuce leaf was placed in a beaker containing various spices, black pepper and/or nutmeg?
4. Using a lettuce leaf to represent a cell membrane, can everything go into a cell?
5. A leaf is a collection of many cells. What did you observe when you added food coloring?
Predict what would happen if you placed a piece of lettuce into a salt solution? #2 Predict what would happen if you placed a piece of lettuce into food coloring? #3 Predict what would happen if you placed a piece of lettuce into a mixture of water and black pepper?
Explain what happened to the lettuce leaves after being placed into various beakers or cups.
2. What can go into and out of a lettuce leaf?
3. What happened when a lettuce leaf was placed in a beaker containing various spices, black pepper and/or nutmeg?
4. Using a lettuce leaf to represent a cell membrane, can everything go into a cell?
5. A leaf is a collection of many cells. What did you observe when you added food coloring?
Predict what would happen if you placed a piece of lettuce into a salt solution? #2 Predict what would happen if you placed a piece of lettuce into food coloring? #3 Predict what would happen if you placed a piece of lettuce into a mixture of water and black pepper?
When a piece of lettuce leaf is placed inside a salt solution, the water from the cells of lettuce leaf will come out as the solution outside is more concentrated than inside the cells of leaf. This happens due to osmosis. As water comes out the cells shrink and the leaf appears wilted due to loss of water.
When a piece of lettuce leaf is placed into a beaker of coloured water and left for sometimes, the leaf gradually takes up the colour of the solution. This shows that the coloured water has entered inside the cells of the leaf as the concentration of the cell sap is higher than the concentration outside.
As the cell membrane of the lettuce leaf is selectively permeable, it does not allow all the particles to move through. Water molecules and some ions can move through it but not pepper particles. Thus when the leaf is placed into water and pepper solution, water enters inside the cells but not pepper.
When a piece of lettuce leaf is placed inside a salt solution, the water from the cells of lettuce leaf will come out as the solution outside is more concentrated than inside the cells of leaf. This happens due to osmosis. As water comes out the cells shrink and the leaf appears wilted due to loss of water.
When a piece of lettuce leaf is placed into a beaker of coloured water and left for sometimes, the leaf gradually takes up the colour of the solution. This shows that the coloured water has entered inside the cells of the leaf as the concentration of the cell sap is higher than the concentration outside.
As the cell membrane of the lettuce leaf is selectively permeable, it does not allow all the particles to move through. Water molecules and some ions can move through it but not pepper particles. Thus when the leaf is placed into water and pepper solution, water enters inside the cells but not pepper.
