Question

An organism is sealed in a chamber. Scientists measure the amount of carbon dioxide and oxygen in the chamber. In 3–5 sentences, explain how they can use the volumes of these gases to determine if photosynthesis or cellular respiration is occurring in in the chamber. (4 points)

Short Answer Rubric (4 points)
Points Awarded Criteria
4
The answer is very clear.

The answer is fully supported by details.

There may be a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.

3
The answer is mostly clear.

The answer is supported by mostly relevant details.

There are a few errors in grammar, usage, or mechanics. Errors do not interfere with meaning.

2
The answer is somewhat clear.

Details are weak or not related.

There are some errors in grammar, usage, and mechanics. Errors interfere with meaning.

1
The answer is not clear.

There are few or no supporting details.

There are many errors in grammar, usage, and mechanics. Errors interfere with meaning.

0 The question is not answered.

Answer 1

To determine if photosynthesis or cellular respiration is occurring in the chamber, scientists can measure the changes in the volumes of carbon dioxide (CO2) and oxygen (O2). During photosynthesis, plants consume CO2 and release O2, leading to a decrease in CO2 levels and an increase in O2 levels. Conversely, during cellular respiration, organisms take in O2 and release CO2, resulting in a decrease in O2 levels and an increase in CO2 levels. By analyzing the specific changes in gas volumes over time, scientists can conclude which process is taking place in the sealed chamber.