Two petri dishes of radish seeds are prepared as follows: a disk of absorbent, but otherwise inert, filter paper is placed in the bottom of each dish and 5 mL of distilled water are added to each disk, then 2 grams of dry radish seeds are spread over each moist disk. One dish is put in a dark cupboard and the other is put on a sunny windowsill. The investigator checks the dishes daily and adds water equally as needed. Seeds in both treatments germinate within 2 days. At the end of 10 days, the plant material on each petri plate is dried and weighed. The results are: -

\begin{array}{llcc} \text {- starting dry weight } &2.00g\\ \text { - sunny windowsill } &2.25g\\ \text { - dark cupboard} &1.75g\\\end{array}

What is the MOST likely explanation for why the dark-grown seedlings lost biomass?
A)The metabolism in the cells of the seedlings increased to compensate for the lack of light energy.
B)Cellular respiration in the cells of the seedlings consumed the starch and oils present in the seeds as sources of energy.
C)Cellular respiration and ATP synthesis needed for growth does not occur as efficiently in plants in the dark as in plants exposed to light.

The Ratio of ATP to NADPH Used by the Calvin

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