Question

What are control variables in this experiment? Select all that apply. Here is the description again: Consider an experiment in which a scientist tests how elevated levels of carbon dioxide affect plant growth. The scientist grows 1 month old oak seedlings in growth chambers under the following conditions: • growth chamber 1: 10 oak seedlings growing with current carbon dioxide levels • growth chamber 2: 10 oak seedlings growing with 1.5X current carbon dioxide levels • growth chamber 3: 10 oak seedlings growing with 2X current carbon dioxide levels Oak seedlings are exposed to these growing conditions for one year. Scientists ensure that lighting, temperature and humidity are consistent across the three growth chambers. Scientists monitor rates of photosynthesis of the seedlings throughout the experiment. At the end, they measure the weight of each plant, carbon content, and nitrogen content. humidity level plant carbon content at the end of the experiment carbon dioxide level plant nitrogen content at the end of the experiment plant weight at the end of the experiment the plants exposed to current carbon dioxide levels temperature photosynthetic rates

          What are control variables in this experiment? Select all that apply.

Here is the description again:

Consider an experiment in which a scientist tests how elevated levels of carbon dioxide affect plant growth.

The scientist grows 1 month old oak seedlings in growth chambers under the following conditions:

• growth chamber 1: 10 oak seedlings growing with current carbon dioxide levels
• growth chamber 2: 10 oak seedlings growing with 1.5X current carbon dioxide levels
• growth chamber 3: 10 oak seedlings growing with 2X current carbon dioxide levels

Oak seedlings are exposed to these growing conditions for one year. Scientists ensure that lighting, temperature and humidity are consistent across the three growth chambers. Scientists monitor rates of photosynthesis of the seedlings throughout the experiment. At the end, they measure the weight of each plant, carbon content, and nitrogen content.

humidity level
plant carbon content at the end of the experiment
carbon dioxide level
plant nitrogen content at the end of the experiment
plant weight at the end of the experiment
the plants exposed to current carbon dioxide levels
temperature
photosynthetic rates

What are control variables in this experiment? Select all that apply.

Here is the description again:

Consider an experiment in which a scientist tests how elevated levels of carbon dioxide affect plant growth.

The scientist grows 1 month old oak seedlings in growth chambers under the following conditions:

• growth chamber 1: 10 oak seedlings growing with current carbon dioxide levels
• growth chamber 2: 10 oak seedlings growing with 1.5X current carbon dioxide levels
• growth chamber 3: 10 oak seedlings growing with 2X current carbon dioxide levels

Oak seedlings are exposed to these growing conditions for one year. Scientists ensure that lighting, temperature and humidity are consistent across the three growth chambers. Scientists monitor rates of photosynthesis of the seedlings throughout the experiment. At the end, they measure the weight of each plant, carbon content, and nitrogen content.

humidity level
plant carbon content at the end of the experiment
carbon dioxide level
plant nitrogen content at the end of the experiment
plant weight at the end of the experiment
the plants exposed to current carbon dioxide levels
temperature
photosynthetic rates

Added by Lori D.

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