By Martin W Wenham
This publication offers fabrics to permit scholars elderly 5-11 years to benefit concerning the international round them via hands-on actions.
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Extra resources for 200 Science Investigations for Young Students: Practical Activities for Science 5 - 11
Activity 4 . 1 . 1 Measuring stem and leaf growth Basic observations on growth are most effective when this is rapid. Marking young leaves on each shoot with dots of quick-drying paint or correcting-fluid provides landmarks for measurements which will usually yield clear results if carried out weekly. Children need to understand clearly that stem growth is measured by length, whereas leaf growth is measured by area. Equipment and materials: Plants; quick-drying white paint or correcting-fluid; pair ofcompasses or dividers; ruler measuring in mm; graph paper with I mm squares, cut into strips about I Ocm wide; stiff card or thin board the same size and shape as the graph paper; soft pencil with sharp point; paper clips or elastic bands; small paper labels.
Because it is not possible to measure the volume of air breathed safely, children's observations must be restricted to breathing movements; but even with this limitation there is plenty to observe and discuss. Equipment Stop-watch or clock; or clock with second-hand. • • • • If possible, carry out observations before and after quite a long period of exercise, such as a PE or games session. Work in pairs: each partner can observe the other's breathing at the same time. Before beginning exercise, observe each other's breathing while you are relaxed and at rest.
Tradescantias will tolerate much lower light levels and prefer less or no direct sunlight; otherwise they have similar needs. Both tolerate drought well and are much more likely to be damaged by over-watering than the reverse. An annual which can be very useful in the classroom is white mustard (Sinapis alba), a member of the cress-cabbage family. It has small, round seeds which are used in cooking and are widely available. 2. 3. 6-4 . 3 . 8 ) . For general observation o f plant structure, plants more than five weeks old are likely to be most useful.