Question

question 3 (1 point)
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how will we determine if photosynthesis has occurred in the coleus leaf?
a) if areas of the leave turn black after treatment with iodine
b) with the oxygen test
c) bases on the presence of chlorophyll
d) based on the presence of ssucrose

Explanation:

Photosynthesis produces starch. Iodine reacts with starch to turn black - blue. So areas of a leaf turning black after iodine treatment indicate starch presence and thus photosynthesis has occurred. Oxygen test is less practical for this as it's hard to isolate and measure oxygen from a single leaf in a simple way. Chlorophyll is present in leaves for photosynthesis but its presence doesn't directly prove photosynthesis has occurred. Sucrose is a product of photosynthesis but not the most common way to test for photosynthesis as starch is more easily detectable with iodine.

Answer:

A. if areas of the leave turn black after treatment with iodine