Preservatives, Stains and Reagents
Telangana Open School (TOSS) · Class 12 · Biology
Most important questions from Preservatives, Stains and Reagents for Telangana Open School (TOSS) Class 12 Biology board exam 2026. MCQs, short answer, and long answer questions with marks.
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Sample Questions
What color does iodine solution turn when it reacts with starch?
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Dark blue
Iodine solution turns dark blue when it reacts with starch, indicating the presence of starch in a sample.
Which of the following is a preservative used in histological preparations?
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Bouin's fluid
Bouin's fluid is a preservative used for rapid penetration and fixation of tissues in histological studies.
What is the main component of Carnoy's fluid?
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Absolute alcohol
Carnoy's fluid contains absolute alcohol (60 ml), chloroform (30 ml), and glacial acetic acid (10 ml), with alcohol being the main component.
Which stain gives a pink or red color to plant tissues?
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Safranin
Safranin is a synthetic dye used as a general stain for plant tissues, giving them a pink or red color.
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