RP2

Question 1

Describe how temporary mounts of plant tissue are made

Answer 1

1. Thin slice;
2. Put on slide in stain;
3. Add cover slip

Question 2

Describe how a scientist could have used the temporary mounts of leaves to determine the mean number of chloroplasts in mesophyll cells of a leaf

Answer 2

1. Select large number of cells at random;
2. Count number of chloroplasts;
3. Divide number of chloroplasts by number of cells;

Question 3

The student cut thin sections of tissue to view with an optical microscope.
Explain why it was important that the sections were thin

Answer 3

1. To allow (more) light through;
2. A single layer of cells to be viewed.

Accept: (thin) for better / easier stain penetration

Question 4

When the student was making their microscope slides, they were told to ensure they did not move the coverslip sideways. Explain why

Answer 4

1. To not damage the chromosomes

Question 5

Mitosis is important in the life of an organism. Give 4 reasons why

Answer 5

1. Growth in cell number;
2. repair tissue
3. Genetically identical cells;
4. Asexual reproduction

Question 6

Explain why the biologist chose to examine 200 cells (eg)

Answer 6

Ensures representative sample;