Postharvest Technology MCQs (Set 21) Posted on September 13, 2026Author agropublishers 0 1. _____________________ are the class of pigments most responsible for the vibrant red, purple, and blue colors found in many fruits and vegetables Glucosinolates Chlorophylls Carotenoids Anthocyanins 2. A browning inhibitor is effective because it prevents phenolic substrates from being converted into ___________________ Starch granules Proteins Sugars Reactive quinones 3. Degreening of citrus fruit using ethylene primarily affects _____________ Internal TSS content Seed viability Peel color Juice content 4. _____________________ is a physiological disorder of mango, characterized by internal breakdown of the flesh, particularly around the seed, and is associated with high-temperature conditions? Stem-end rot Spongy tissue Black tip Anthracnose 5. ________________________________ is the phytochemical most closely associated with the development of superficial scald in stored apples Quercetin Resveratrol Lycopene α-Farnesene 6. _______________ is the hormone application commonly used to hasten uniform ripening in papaya Ethephon Abscisic acid Auxin Gibberellic acid 7. The bitterness in fresh olives is primarily due to the presence of _____________ Citric acid Tannic acid Oleuropein Chlorogenic acid 8. The correct biochemical sequence for enzymatic browning in fruits and vegetables is _______________________________ Phenolics → sugars → starch Phenolics → quinones → brown polymers Proteins → phenolics → chlorophyll Carotenoids → anthocyanins → tannins 9. Oxygen is essential for aerobic respiration in fruits, primarily because it functions as the _______________________ First substrate of glycolysis Activator of fermentation Primary source of glucose Final electron acceptor in the mitochondrial electron transport chain 10. In potato tubers, chlorogenic acid contributes to browning mainly when it undergoes ________________ Reduction Fermentation Oxidation Esterification Loading … Question 1 of 10