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Given below are two statements, one is labelled as Assertion (A) and other one labelled as Reason (R).
Assertion (A) : Potato plant tissues commonly show increase in sugar concentration at temperature below 10°C as a result potato tubers
become undesirably sweeter when stored in cold storage at 4-5°C.
Reason (R) : At low temperature, enzymatic conversion of sugar to starch and sugar to CO2 + HO + Heat is reduced drastically as
compared to enzymatic conversion of starch and sugar.
In light of the above statements, choose the correct answer from the options given below.
EXPLANATION
Post-Harvest Handling, Off-Aroma Enzymes, Pac
- Assertion (A): Potato tubers (Solanum tuberosum) stored below $10^\circ\text{C}$ (especially at $4 - 5^\circ\text{C}$) undergo "cold-induced sweetening" (CIS), accumulating high levels of reducing sugars (glucose and fructose) that impart an undesirable sweet taste and cause dark Maillard browning during frying. (True).
- Reason (R): At chilling temperatures, respiratory starch re-synthesis and mitochondrial oxidation are sharply depressed, while amylolytic starch breakdown (catalyzed by $\beta$-amylase and vacuolar acid invertase) continues, shifting the metabolic equilibrium toward free hexose sugar accumulation. (True and directly explains Assertion A).
- Correct Option: Option 1 (Both (A) and (R) are true and (R) is the correct explanation of (A)).
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