Pyrethrum is a natural insecticide derived from: ((MCAER 2014))

✅Explanation: Ethylene is a plant hormone that promotes fruit ripening. It is naturally produced by plants, and it can also be artificially applied to accelerate the ripening process.

📌 Other Options Explanations:
-Option B: Auxin is a plant hormone that promotes root growth and cell elongation.
-Option C: Gibberellin is a plant hormone that promotes stem growth and seed germination.
-Option D: Cytokinin is a plant hormone that promotes cell division and growth.

🔑Key Points:

• Ethylene:
-Ethylene plays a key role in the ripening of the fruit.​
-​Ethylene has been found as not harmful or toxic to humans.
-Ethylene is a gas (C2H4) produced by plants and known as the “ripening hormone,”.
-It stimulates fruit ripening.
-Calcium carbide is also used in some countries for artificially ripening fruit.
-When calcium carbide comes in contact with moisture, it produces acetylene gas.
-Acetylene gas provides similar effects to the natural ripening agent, ethylene.