Subtopic: Controlled and modified atmosphere storage
Question Statement:
Which of the following atmospheric modifications is/are standard operational practice in Controlled Atmosphere (CA) storage of fresh apples?
Options:
(A) Reduction of oxygen ($O_2$) concentration from normal ambient ($21\%$) down to $1\% - 3\%$
(B) Maintenance of elevated carbon dioxide ($CO_2$) concentration typically around $1\% - 5\%$
(C) Continuous scrub-removal of ethylene ($C_2H_4$) gas to retard ripening and senescence
(D) Maintenance of zero relative humidity to prevent mold growth
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
• A and B are correct: Hypoxic (1–3% O2) and hypercapnic (1–5% CO2) environments sharply suppress mitochondrial respiration rate.
• C is correct: Continuous scrubbing of ethylene retards softening and senescence.
• D is false: Relative humidity must be kept high (90–95%) to prevent moisture loss, shriveling, and weight loss.