Biology
If the colour of a leaf changes to blue-black when a few drops of iodine are added to it, then it shows the presence of
- starch
- glucose
- protein
- vitamins
Photosynthesis
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Answer
starch
Reason — Iodine changes the colour of leaf to blue-black showing the presence of starch and thus shows the photosynthesis in that leaf.
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Fill in the blanks:
All organisms need _________ to live and grow.