Question

Circle one answer: The results of the iodine test were positive/negative for starch. _____________ molecules formed...

  1. Circle one answer: The results of the iodine test were positive/negative for starch.

_____________ molecules formed during the process of __________ are converted to starch storage.

Based on your knowledge of photosynthesis, list and explain at least two factors that could lead to a negative iodine test.

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Answer #1

First Part:

The answer will be positive.

Explanation: Starch gives positive result for iodine test. In presence of starch, iodine test provides blue-black color.

Second Part:

The answer will be glucose molecules & photosynthesis process.

Explanation: During photosynthesis, glucose is formed using light, water & CO2 that is stored as starch molecules in plants.

Third Part:

Note: Assuming this question asked about plants.

Negative iodine test will occur when amount of starch is very low. This will occur when photosynthesis is not occurring in plants & as a result plant will use stored starch. So, two factors that can resulted in negative iodine test are inadequate light & water. These two factors are essential in plants to conduct photosynthesis & absence (or inadequate amount) will hamper photosynthesis.

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