Investigating the effect of gravity

• You can do another experiment to investigate the effect of gravity on the growth of cress seeds like this:

  1. Put four cress seedlings into a petri dish that's lined with damp cotton wool. The roots of each cress seedling should be pointing in a different direction
  2. Store the petri dish vertically for a few days in the dark, so you know your results won't have been affected by light
  3. You should find that the roots of each seedling grow downwards, towards gravity, and the shoots grow upwards, away from gravity