Review the section "Investigating Life: Solar-Powered Salamanders." The researchers added CO2 tagged with a radioactive isotope of carbon to a solution surrounding salamander eggs and incubated some eggs in the light and some in the dark. After two hours, the researchers measured the amount of radioactivity in the eggs and found that the eggs incubated in the light had more radioactive carbon than the eggs incubated in the dark. What process occurred in the eggs incubated in the light but not in the eggs incubated in the dark to account for the higher amount of radioactive carbon?

A) photorespiration
B) photosynthesis
C) diffusion of CO2
D) cellular respiration that produces CO2

A) photosynthesis

Explanation:

Photosynthesis is the process by which plants make their own food in the presence of sunlight  by utilising carbon dioxide (CO2) and water (H2O) and form oxygen (O2) and glucose(C6H12O6).

In the Solar-Powered Salamanders, salamander eggs undergoes the process of photosynthesis when incubated in light and dark conditions. The egg incubated in light condition utilises more carbon isotope  as catalysed by the light source, same as photosynthesis and shows more radioactive carbon. Due to the adsence of light, the other egg is unable to consume much carbon isotope.

Hence, the correct option is A) photosynthesis

d) center of the mid-ocean ridge

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