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After 24 hours, the amount of gas that accumulated at the top of the inverted test tube is measured. The students conclude that the light source is causing the water to evaporate, causing water vapor to fill the top of the tube. The best alternative explanation of the differences between the setups is that the answer

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danilosanmartin
Attached is an image that wherein the question is being referred from.

There are choices for this question namely:

A- gravity increased the downward flow of the trapped water
B- metabolism of the elodea plants absorbed CO2 from the water
C- heat from the light source caused the escape of dissolved gas
D- light caused the elodea plants to photosynthesize, releasing O2 gas

The correct answer is that light caused the Elodea plants to photosynthesize, releasing O2 gas. Choice A is not true as if gravity increased the downward flow of the water, then the model without light should have air accumulated in the test tube too. In Choice B, while it is true that the plant may have absorbed the dissolved CO2 in water, this does not explain why there is gas on top of the test tube. Choice C may only evaporate the water, not cause the escape of dissolved gases. In choice D, however, light caused the Elodea plants to perform photosynthesis releasing O2 gas compared to the other model without light wherein the plant cannot perform photosynthesis thereby not releasing O2 gas therefore no gas is seen on top of the test tube. 
Ver imagen danilosanmartin

Evaporation is defined as the process of conversion of liquid into vapor or gaseous form. In the given experiment light is causing evaporation because light causes the plants to release oxygen and perform photosynthesis.

Elodea plants are water seaweeds that perform photosynthesis in the presence of light. The students performed an experiment in which the gas is collected in the inverted test tube because plants performed the photosynthesis that caused the plants to release gaseous oxygen. The gas is collected in the inverted test tube, which can be observed by the students.

Reasons for incorrect answers:

  • The gravity will increase the downward movement of water. The model will not function properly and in the absence of light air could have normally accumulated in the test tube.
  • The plants may have utilised carbon dioxide, but to perform photosynthesis, the plants require carbon dioxide and release oxygen.
  • The heat in the light source activated the plant to perform photosynthesis. The heat only caused evaporation and does not causes release of any dissolved gas.

Therefore, the correct answer is that the light caused Elodea plants to perform photosynthesis and release oxygen.

To know more about light and photosynthesis, refer to the following link:

https://brainly.com/question/13602279?referrer=searchResults