question_answer 81)

The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement of the labelled carbon dioxide.

Answer:

                  If a radio labelled carbon C14 in is supplied to patato plants while it's carrying outphotosynthesis in the presence of light, the  will be fixed and form radioactiveproducts of photosynthesis, i.e., glucose . This radioacative glucose is converted to sucrose which would again be radioactive due totransfer of C14 from previous sugar molecule. These sucrose molecules then move into phloem and transported to other parts of plant. Autoradiography technique detects the radioactive carbon (present in sugars) and tracesthe components and movement in the plant, i'.e., through sieve tube channels of phloemfrom leaves (sources) to different parts (sink).