Advanced Science Primary 3 Cycles

Siti wants to find out if light is needed for seeds to germinate. She sets up two containers. Which variables must she keep the SAME?

A Amount of water, type of seeds, and presence of light
B Type of seeds, presence of air, and presence of light
C Amount of soil, presence of light, and temperature
D Amount of water, type of seeds, and temperature
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Worked Solution

Step 1: The tested variable (independent variable) is light. Step 2: All other conditions for germination (WOW: Water, Oxygen, Warmth) must be identical. Step 3: Therefore, water, seed type, and temperature must be the same.

Correct answer: Amount of water, type of seeds, and temperature

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