Johnson, Ariana

Question

DISTRICT Biology 1 Unit 1 24/25
9 of 279 of 27 Items

Question
A student performed an experiment to test the hypothesis that glucose produced during photosynthesis is converted to starch for storage in the plant. For the experiment, the student used a plant with variegated leaves, which have green areas that are chlorophyll-rich and white areas that lack chlorophyll. The student used iodine solution, which turns blue-black in the presence of starch, as an indicator. The table shows the experimental procedure.

The student observed and recorded that all three samples from the green portions of the leaves turned blue-black, while the white portions remained colorless. Do the results of the student’s experiment support the hypothesis?

Responses

The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the glucose produced during photosynthesis was converted to starch.
The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the glucose produced during photosynthesis was converted to starch.

The results do not support the hypothesis because the portions of the leaves lacking chlorophyll tested negative for starch, indicating the glucose produced during photosynthesis was not converted to starch.
The results do not support the hypothesis because the portions of the leaves lacking chlorophyll tested negative for starch, indicating the glucose produced during photosynthesis was not converted to starch.

The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the starch produced during photosynthesis was not converted to glucose.
The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the starch produced during photosynthesis was not converted to glucose.

The results do not support the hypothesis because the portions of the leaves lacking chlorophyll tested negative for starch, indicating the starch produced during photosynthesis was converted to glucose.

Answer 1

The best response to your question about whether the results of the experiment support the hypothesis is:

The results support the hypothesis because the chlorophyll-rich portions of the leaves tested positive for starch, indicating the glucose produced during photosynthesis was converted to starch.

This is the correct interpretation of the results. The positive test for starch in the green areas (where chlorophyll is present and photosynthesis occurs) suggests that glucose produced during photosynthesis is indeed being converted to starch for storage. The negative test in the white areas (lacking chlorophyll) supports this conclusion, as photosynthesis cannot occur in those areas, therefore no glucose (and consequently no starch) is produced there.