Question 21
Source instructions: For multiple choice problems circle the right answers. Some problems may have more than one right answer. For essay problem, give explanation briefly.
The photosynthesis in terrestrial plant could be proved by wrapping one leaf by the aluminum foil for 24 hours (treated leaves) while keeping the other leaves uncovered (control). The next day, the aluminum foil was removed from the leaves. Both treated and untreated leaves were soaked in alcohol and then boiled until the leaves turned pale. A drop of iodine solution (starch staining) was subsequently dripped onto the leaves.
a) What will happen with the treated leaves and why? (2 points)
b) What will happen with the control leaves and why? (2 points)
The photosynthesis in terrestrial plant could be proved by wrapping one leaf by the aluminum foil for 24 hours (treated leaves) while keeping the other leaves uncovered (control). The next day, the aluminum foil was removed from the leaves. Both treated and untreated leaves were soaked in alcohol and then boiled until the leaves turned pale. A drop of iodine solution (starch staining) was subsequently dripped onto the leaves.
a) What will happen with the treated leaves and why? (2 points)
b) What will happen with the control leaves and why? (2 points)