Calculations

Question 1

How do you calculate percentage change?

Answer 1

CHANGE ÷ START × 100

Question 2

What does a negative % change mean?

Answer 2

A decrease in value (e.g., water loss in osmosis).

Question 3

What is the formula for actual size of a cell?

Answer 3

Actual size = Image size ÷ No. of cells.

Question 4

Why are ratios used in biology?

Answer 4

To compare sizes or quantities, e.g., surface area to volume.

Question 5

What does a 1:5 ratio mean?

Answer 5

For every 1 part of one thing, there are 5 parts of the other.

Question 6

What unit is typically used for cell size?

Answer 6

Micrometres (µm)