RP8 - the effect of light or gravity on seedling growth

• what is the equipment?

  - newly germinated seeds

  - three Petri dishes

  - cotton wool or compost

  - water and pipette
• what should you do once you have three Petri dishes containing five newly geminated seedlings growing in a layer of cotton wool or compost?

  measure the length of each shoot from the base to the tip
• what should you do after measuring the length of the shoots for the first time?

  move the Petri dishes into position - one on a windowsill in full sunlight, one in a dark cupboard and one placed in partial light
• what should you do after moving the Petri dishes into position?

  leave the experiment for a week until the seedlings have grown - adding water everyday
• what should you do after leaving the seedlings for a week?

  measure the length of each shoot from root to tip - if a shoot is curved, use a piece of string or straighten it before measuring