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UPSC 1998: Which one of the following statements regarding starch and cellulose is NOT correct?
(a)Both of them are of plant origin
(b)Both of them are polymers
(c)Both of them give colour with iodine
(d)Both of them are made up of glucose molecules
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Not attemptedCorrect Answer: (c) Both of them give colour with iodine
Starch and cellulose are both plant-derived glucose polymers, but only starch’s helical amylose component forms a blue-black complex with iodine; cellulose’s linear β-1,4 chains do not. Thus the statement “Both of them give colour with iodine” is incorrect, making option (c) the answer. ([licchavilyceum.com](https://licchavilyceum.com/upsc-civil-services-prelims-1998-solved-question-paper/?utm_source=openai))
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Frequently Asked Questions
What is the correct answer to this UPSC 1998 Science & Technology question?▼
The correct answer is option (c): Both of them give colour with iodine. Watch the detailed video explanation in our Sherlocking Prelims course on UnlockIAS.
Which year was this Biology question asked in UPSC Prelims?▼
This question was asked in UPSC CSE Prelims 1998, GS Paper 1, as Question 121. It falls under Science & Technology > Biology.
What is the difficulty level of this UPSC question?▼
This question is rated "easy". It tests basic recall and most well-prepared aspirants should answer it correctly.
How many UPSC Prelims questions have been asked from Biology?▼
UPSC has asked 97 questions from Biology (under Science & Technology) across multiple years. Visit the topic page to see the full list and year-wise trends.