Asked by J.Sarah - Need help
My full question.
A leaf was plucked from the garden. The procedure for testing for starch in the leaf was carried out. Part of the leaf turned blue-black and part of the leaf just turned brown.
Question : Why do you think the other part of the leaf did not contain starch?
A leaf was plucked from the garden. The procedure for testing for starch in the leaf was carried out. Part of the leaf turned blue-black and part of the leaf just turned brown.
Question : Why do you think the other part of the leaf did not contain starch?
Answers
Answered by
DrBob222
The test for starch is to add I2. The presence of starch is indicated by the dark-blue color formed upon the addition of the I2. The part that didn't turn blue-black has stopped making carbohydrates (starch) due to injury or natural dying of the leaf or due to seasonal changes (summer to fall).