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Namet he volatile substance which was co...

Namet he volatile substance which was confirmed by coisins from riperied oranges.

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### Step-by-Step Solution: 1. **Identify the Volatile Substance**: The question asks for a volatile substance confirmed by Cousins from ripened oranges. The answer is **ethylene**. 2. **Chemical Formula**: The chemical formula of ethylene is **C2H4**. 3. **Cousins' Experiment**: Cousins conducted an experiment where he placed unripened bananas next to ripened oranges. After 1 to 2 days, he observed that the unripened bananas ripened as well. 4. **Conclusion of the Experiment**: From his observations, Cousins concluded that a substance was being transferred from the ripened oranges to the unripened bananas, which was identified as ethylene. 5. **Nature of Ethylene**: Ethylene is a gaseous substance, which explains its ability to diffuse and affect nearby fruits. 6. **Role of Ethylene**: Ethylene is classified as a Plant Growth Regulator (PGR) and plays several important roles in plant development, including: - Promoting fruit ripening. - Inducing abscission (the process of shedding leaves or fruit). - Influencing senescence (aging of leaves). - Assisting in seed germination. - Supporting shoot and root growth.
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