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B
Lignin
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C
Protein
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D
Cutin
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Solution
The correct option is A Lignin The histological and cytological studies use stains to differentiate the appearance of different organelle and improve its visibility. Safranin reacts with lignin and stains it red resulting in all lignified tissues such as xylem and sclerenchyma turning while other tissues like parenchyma, collenchyma and phloem remain colourless.