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Ethylene gas...

Ethylene gas

A

Is saturated hydrocarbon

B

Slows down ripening of apples

C

Retards ripening of tomatoes

D

Speeds up maturation of furits

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The correct Answer is:
### Step-by-Step Solution: 1. **Understanding Ethylene Gas**: Ethylene (C₂H₄) is a gaseous plant hormone that plays a crucial role in the ripening of fruits. It is classified as an unsaturated hydrocarbon due to the presence of a double bond between the two carbon atoms. 2. **Analyzing the Statements**: - **Statement A**: "Ethylene gas is a saturated hydrocarbon." - This statement is **incorrect** because ethylene has a double bond, making it an unsaturated hydrocarbon. - **Statement B**: "Ethylene gas slows down ripening of apples." - This statement is also **incorrect**. Ethylene actually promotes the ripening process rather than slowing it down. - **Statement C**: "Ethylene gas retards ripening of apples." - This statement is **incorrect** for the same reason as statement B. Ethylene promotes ripening, not retards it. - **Statement D**: "Ethylene gas speeds up the maturation of fruits." - This statement is **correct**. Ethylene is known to accelerate the maturation and ripening of fruits. 3. **Conclusion**: Based on the analysis of the statements, the only correct statement regarding ethylene gas is that it speeds up the maturation of fruits. ### Final Answer: The correct statement is that ethylene gas speeds up the maturation of fruits. ---
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