Question

1. how does the amount of light affect the growth of a plant? constant/control variables: __________ hypothesis/prediction: ________ 3. how does the amount of oxygen in the water affect the oyster population? constant/control variables: ________ hypothesis/prediction: ________ 4. how will the amount of fertilizer used on a field affect the number of earthworms found there? constant/control variables: ________ hypothesis/prediction: ________ 5. how does the length of a string affect the number of times a pendulum will swing back and forth in 10 seconds? constant/control variables: ________ hypothesis/prediction: ________ 6. how does the size of a bicycle tire affect the distance it will travel when it is pedaled in a given number of times? constant/control variables: ________ hypothesis/prediction: __________

Explanation:

2. How does the amount of light affect the growth of a plant?

Constant/Control Variables could be type of plant, soil type, amount of water, temperature. Hypothesis could be: More light will lead to faster plant growth as it is essential for photosynthesis.

Constant/Control Variables might be water temperature, salinity, presence of predators. Hypothesis could be: Higher oxygen levels in water will support a larger oyster population as oysters need oxygen to survive and reproduce.

Constant/Control Variables could be type of soil, field location, amount of rainfall. Hypothesis might be: An appropriate amount of fertilizer will increase the earthworm population by enriching the soil, but too much may be harmful.

Answer:

Constant/Control Variables: Type of plant, soil type, amount of water, temperature
Hypothesis/Prediction: More light will lead to faster plant growth due to photosynthesis

3. How does the amount of oxygen in the water affect the oyster population?