Fair test with plants

1. If Jonah wants to see how sunlight affects plant growth, what should they do?

   • Put both plants outside with no sun
   • Give one plant sunlight, keep the other in dark (right)
   • Give one plant more water and less sun

2. To test if soil type affects plant growth, what should Sam do?

   • Let one plant grow without soil
   • Use same water and sun for both plants (right)
   • Give one plant more water and less sun

3. Nora puts two seeds in pots with different amounts of water. What is wrong with this test?

   • More than one thing changed (right)
   • One plant got more water
   • Both plants were in sunlight

Tip: In a fair test, only one factor should change so you can know what caused the difference. All other things must stay exactly the same.