Experiment: Two plant samples were placed in sealed jars, one with a lit candle, one without. Oxygen and CO₂ were measured after 12 hours.Observation: The candle jar had lower oxygen and higher CO₂ compared to the plant-only jar.Question: What is the likely explanation?

Question

TestUstad · Accepted Answer

Combustion uses oxygen and produces carbon dioxide.. In the experiment, the jar with the lit candle had lower oxygen levels and higher CO₂ levels compared to the plant-only jar. This indicates that the candle's combustion process used up oxygen and produced carbon dioxide, explaining the observed differences. The correct answer highlights the role of combustion in altering gas levels. The incorrect options misinterpret the effects of candles on oxygen levels, the behavior of plants with light, or the outcome of burning wax, making them inaccurate explanations.

TestUstad · Answer

Candles increase oxygen by heating the air.

TestUstad · Answer

Plants release CO₂ in light only.

TestUstad · Answer

Burning wax generates oxygen.

Experiment: Two plant samples were placed in sealed jars, one with a lit candle, one without. Oxygen and CO₂ were measured after 12 hours.Observation: The candle jar had lower oxygen and higher CO₂ compared to the plant-only jar.Question: What is the likely explanation?

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