A student prepares a microscope slide using a thin, colourless epidermal peel from a white lily petal.

The student adds crystal violet before viewing the cells. Explain how this helps the student to distinguish between structures within each cell.

One edge of a cover slip is placed on the slide before the rest of the cover slip is lowered slowly using a mounted needle. Give one reason for using this technique.

A row of 16 adjacent cells extends for 1.12 mm from the outer edge of the first cell to the outer edge of the last cell. Estimate the mean width of one cell. Give your answer in $μm\mu\text{m}$ .

The student selected this row because it contained the widest-looking cells. Suggest why this is not a suitable way to estimate the width of a typical cell.

A student prepares a microscope slide using a thin, colourless epidermal peel from a white lily petal.

The student adds crystal violet before viewing the cells. Explain how this helps the student to distinguish between structures within each cell.

One edge of a cover slip is placed on the slide before the rest of the cover slip is lowered slowly using a mounted needle. Give one reason for using this technique.

A row of 16 adjacent cells extends for 1.12 mm from the outer edge of the first cell to the outer edge of the last cell. Estimate the mean width of one cell. Give your answer in $μm\mu\text{m}$ .

The student selected this row because it contained the widest-looking cells. Suggest why this is not a suitable way to estimate the width of a typical cell.

1.1 Cell structures

Question 4

Markscheme

1.1 Cell structures

Question 4

Markscheme

1.1 Cell structures

Question 4

1.1 Cell structures Questions

1.1 Cell structures

Question 4

1.1 Cell structures Questions