Basic Needs of Organism.

Let's do an experiment.

Plant Need Sunlight.

Hypothesis: Plants need sunlight to survive.

Constant variable: The species and size of the balsam plant.
Manipulated variable: The presence of sunlight.
Responding  variable: Growing condition of the balsam plants.

Produce:

1. Put the balsam plant T and U under the sun.
2. Use a black box to cover balsam plant U.
3. Water the balsam plants T and U everyday. After 1 week, observe the growing condition of balsam plant T and U.

Observation:

Balsam Plant	Growing Condition
T	Grew healthily
U	Turned yellow

Concluesion: Plants need sunlight to grow.