Question

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:- starting dry weight 2.00 g- sunny windowsill 2.25 g- dark cupboard 1.75 gWhat is the MOST likely explanation for why the dark-grown seedlings lost biomass?Select one: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.

Answer 1

Answer: B

Explanation:

Plants make their food via photosynthesis. However, in temporary absence of sunlight for photosynthesis, they result to the use of stored up starch and oil for generation of energy and cellular respiration. This resulted in the lose of weight in the radish in the cupboard. It should be noted, that if it is left in the cupboard longer without sunlight, it will eventually use up all stored energy, dry up and die.