Photosynthesis Experiment with Paper Strips

Which leaf gave a positive starch test in the covered portion?

a) The one covered with black paper strip
b) The one covered with green paper strip
c) The one covered with white paper strip
d) The one covered with transparent paper strip

Final answer:

The leaf that would give a positive starch test in the covered portion is the one covered with a transparent paper strip, because the transparent paper would allow light to pass and photosynthesis to occur producing starch. Therefore the correct option is d) The one covered with transparent paper strip.

Explanation:

This question is about the effect of light on photosynthesis in plants. The process of photosynthesis requires light. The starch test is a method used to determine whether photosynthesis has occurred, as the process produces starch within the leaf.

In this experiment, the leaf covered with a transparent paper strip would yield a positive result in the starch test. This is because the transparent paper would still have allowed the passage of light necessary for photosynthesis to occur.

The other leaves covered with black, green, and white paper strips would not show a positive starch test as these types of paper block the necessary light. Thus, they inhibit the photosynthesis process and by extension, the production of starch.

It's all about how much light can penetrate through the overlay to facilitate photosynthesis. Therefore the correct option is d) The one covered with transparent paper strip.