Lesson 1 What varies?

Activity 3

Drying leaves

A fresh leaf contains water. When a leaf loses water, it dries up and becomes shrivelled.

The leaf may lose water from its top surface, or from its bottom surface, or from both surfaces. This investigation will help you find out which surface a leaf loses most water from.

Two days ago, some Vaseline was spread on some of the leaf surfaces.
If a surface has Vaseline on it, water cannot escape from that surface.

Look at the four leaves hanging up.imageimageimageimageimage

Leaf 1 had Vaseline spread on its top surface.

Leaf 2 had Vaseline spread on its bottom surface.

Leaf 3 had Vaseline spread on both its surfaces.

Leaf 4 had no Vaseline spread on its surfaces.

Fill in the table in your Notesheet (Section 3), and answer the questions.


Two variablesimageimage

Heights and weights

Here are pictures of six children.

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Veena

Clark

Sharon

Susan

Robert

Lee

Height (cm)
Weight (kg)

148

43

146

31

151

38

142

35

149

34

144

42

The height (measured in centimetres) and the weight (measured in kilograms) of each person is written in the table.

On your Notesheet, complete the table. Put each person in order of height, with the shortest first and the tallest last.

When you have completed the table, answer the questions.


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License

Thinking Science Lessons Copyright © by Caroline Yates, Michael Shayer, and Philip Adey. All Rights Reserved.

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