Cells lesson 9

1. Investigating mass loss
Target
To complete the investigation of
mass loss in leaves
Wednesday, February 8, 2017

2. Method
• Choose 4 similar sized leaves
• Put Vaseline on the top of one leaf, the
bottom of another, top and bottom of the
third and leave the last one with no
Vaseline.
• Weigh all four leaves and put them on an
A4 sheet of paper and leave them to dry
until the next lesson.

3. Results
Part of leaf
covered
Start mass
(g)
End mass
(g)
Loss of
water (g)
Top
Bottom
Both sides
None

5. Prediction
• 1. The leaves will weigh less next week.
• 2. This is because the water in the leaves goes
into the air – evaporates.
• 3. The leaf that will lose the most mass is ….
Worksheet – answer the questions.
• Write down what you predict will happen
when the mass of water loss is calculated
later.
• What is the reason for your prediction?