Artificial ripening of fruits by ethylene gas is permitted up to a concentration of _____

Correct option is B

✅ (b) 100 ppm:
· The use of ethylene gas for artificial ripening of fruits is regulated to ensure consumer safety and quality.
· The permissible concentration of ethylene gas for ripening is up to 100 parts per million (ppm).
· Ethylene is a natural plant hormone that accelerates ripening. Controlled use of ethylene helps maintain fruit quality and shelf life.
· Higher concentrations may lead to over-ripening or unsafe residues.
❌ (a) 200 ppm: Exceeds permitted safe limit. ❌ (c) 150 ppm: Above permitted limit. ❌ (d) 250 ppm: Too high and unsafe.