The correct option is (a).
Explanation
The odour produced during the combustion of a material depends on its chemical composition. Natural fibers are generally classified into plant fibers (cellulosic) and animal fibers (proteinaceous).Statement 1 is Correct: Both paper and cotton are plant-based materials composed primarily of cellulose (a complex carbohydrate). When burnt, cellulosic materials produce a characteristic odour resembling burning leaves or grass. Since both paper and cotton share this chemical composition, they emit a similar smell upon combustion.
Statement 2 is Incorrect: The similarity in odour suggests that paper is made of cellulose, similar to cotton, and not animal proteins. Materials made of animal proteins (such as wool, silk, or hair) produce a distinct odour of burning hair when burnt. Paper is derived from plant pulp and does not contain animal proteins.
Key Takeaway: Burning cellulose (cotton, paper) smells like burning leaves, whereas burning protein (wool, silk, hair) smells like burning hair.