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: 3. Mark 3 of the pots to be watered.
: 4. Mark the other 3 not to be watered.
: 5. Water half of the pots everyday.: 6. Observe the results after 1 week.
===Plants and Nutrients===
: 1. Place some cress seeds into 3 pots with soil.: 2. Place the same number of cress seeds into some pots with cotton wool.: 3. Water the pots everyday.: 4. Observe the pots after 1 week. ===Plants and Air===: 1. Place a plant with a 10cm stem into a bell jar.: 2. Use a vacuum pump to remove the air from the bell jar.: 3. Observe the changes to the plant.