Plan an investigation to show the effect of light from one direction on the growth of plant seedlings.Include details of any controls needed.
Several seedling in each batch
Measure heights of shoots
Leave some in dark with light from one side/direction in box with hole
Control with all-round light
Control variables e.g same temp, water, soil type
After suitable time - several hours
record appearance of seedlings
re-measure heights of shoots
e.g use thread or straighten them out
calculate mean height increase for each group
use ruler/protractor to estimate angle of bending