Plan an investigation to show the effect of light from one direction on the growth of plant seedlings. Include details of any controls needed. You may use some of the equipment shown in Figure 1 and any other laboratory apparatus. – 7064

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1. Put several seedlings in each batch (or in one pot for each batch).

   Measure the starting height of all shoots.

   Keep some seedlings in the dark with light coming from only one side (e.g. in a box with a hole).

   Have controls:

   Seedlings with light from all around.

   Seedlings on a rotating clinostat.

   Seedlings kept fully in the dark.

   Keep all other factors the same (temperature, water, soil type).

   After several hours or days, observe and record the seedlings’ appearance in relation to light direction.

   Measure the new height of each shoot.

   Measure bending of shoots — e.g. use thread to follow the curve, then straighten to measure length, or use a ruler/protractor to find the bending angle.

   Calculate the mean height increase for each group.

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