Final answer:
Mangoes are harvested when they are still green and ripen during transport to avoid spoilage. They ripen through hormonal signals, and ethylene can speed this process in a confined space like a bag.
Step-by-step explanation:
Mangoes are generally harvested when they are still green and ripen during the marketing process of transport. This approach is used with most commercial fruits to ensure they do not spoil before arriving at supermarkets, which often are far from the place of picking.
Fruits know when to fall from the tree by a signal sent through a type of hormone. These hormones also influence the ripening process, such as ethylene, which can be trapped in a brown bag to accelerate ripening of fruits like bananas and avocados after purchase.