A plant is kept in the dark for two days. A leaf is used in an experiment to investigate the effect of two factors on photosynthesis as shown in the diagram.
What are the colours of Q and R, when the leaf is tested for starch, using iodine solution?
A. (a)
B. (b)
C. (c)
D. (d)
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Answered by
55
Q will have blue black colour as it was exposed to sunlight
R will have brown colour as it had no carbon dioxide and sunlight
Answered by
17
After the experiment, when the leaf us tested for starch using iodine solution, the Q part will be a bluish black, indicating the presence of starch.
Explanation:
- However, the R portion will be brown in colour, since that part was not exposed to either sunlight or carbon dioxide. Starch being a polysaccharide, consists of two types of molecules: Amylose and amylopectin. Amylose is the starch, which is responsible to forming the deep blue color when in contact with iodine.
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