A student investigating the importance of wavelengths above and below the visible spectrum for photosynthesis sets up an experiment as follows over a 2-month period, all with illumination at 1 meter distance from plants grown with the same soil and watering conditions. ollapse 3 Arabidopsis plants exposed to ultraviolet light (UV) 3 Arabidopsis plants exposed to infrared light (IR) 3 Arabidopsis plants exposed to white light At the end of the experiment, she finds that the IR treated plants are scorched, the UV treated plants have wilted, but the white light-treated plants are growing normally. Which of the following statements is most likely to be correct?
A) Three plants do not provide sufficient replications to draw a conclusion
B) Wavelength of light is the only variable that has been changed between groups.
C) The wavelength of light does not affect photosynthesis.
D) Infrared light contains more energy than the other wavelengths.

Explanation:

It provides the outcome of the three independent experiment, therefore it has the sufficient replications to draw a conclusions. Thus option a is incorrect.

Here, the different wavelength of light has been provided to the Arabidopsis plants. Thus, option b is correct.

The wavelength of the light affects the photosynthesis in plants because it helps in excitation of the chlorophyll electrons and transfer it to higher energy level in order to prepare food on their own. Ultraviolet light consists  smaller wavelength with high energy photons in comparison to the infrared light.

The infrared light refers to the longer wavelength with low energy photons. Therefore, UV light may cause the leaf burn (scorching and wilting).Thus, option D is incorrect.

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The correct answer is : B) Wavelength of light is the only variable that has been changed between groups.

Explanation:

In this three plants in three different conditions shows three different outcomes so their is sufficient replication to draw a conclusion. The wavelength of the light affects the growth of the plant. UV light has very low wavelengths below 400 nm than the photons required similarly Infrared light has higher wavelengths that is low energy light, UV can cause wilting and leaf burn.

So, the wavelengths of the light and growth of plant are related and this experiment only wavelengths of the lights are changed.

Thus, the correct answer is :  B) Wavelength of light is the only variable that has been changed between groups.

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