What is the focus of postharvest physiology?

• A. How harvested plant products continue to respire, ripen, and deteriorate, affecting shelf life and quality.
• B. How to transplant seedlings into fields.
• C. Soil nutrients cycling after harvest.
• D. How to maximize seed production.

Answer: (A)

Postharvest physiology focuses on what happens to harvested plant products after they are removed from the plant. The key idea is that metabolism doesn’t stop at harvest—these tissues continue to respire, ripen, and eventually deteriorate, and these processes determine how long the product remains usable and of good quality. Understanding how respiration rate, ethylene-driven ripening in climacteric fruits, moisture loss, microbial decay, and storage conditions interact allows us to manage temperature, humidity, atmosphere composition, and packaging to slow deterioration and extend shelf life.

The other topics don’t fit this focus. Transplanting seedlings into fields is about establishing crops, not postharvest changes. Soil nutrient cycling after harvest concerns soil fertility and nutrient availability, not the physiology of harvested plant products. Maximizing seed production deals with reproductive output, not the postharvest behavior of harvested tissues.