GATE AG 2018 • Q28 MCQ • 1 Mark

Section 6: Agricultural Process Engineering

Evaporation and Drying

Subtopic: Hydrothermal treatments

Question Statement:

Which one of the following statements related to parboiling of paddy is NOT correct?

Options:

  • (A) Irreversible granule swelling occurs during heating.
  • (B) Parboiling process is used to salvage wet or damaged paddy.
  • (C) Parboiled rice takes less time to cook as compared to raw rice due to starch gelatinization.
  • (D) Milling yield of paddy increases due to starch gelatinization.

Official Answer Key:

C

Step-by-Step Solution & Explanation

(A) is correct — soaking and steaming cause irreversible swelling of starch granules. (B) is correct — parboiling is a standard salvage route for wet/partially damaged paddy. (D) is correct — gelatinization hardens and seals the kernel, reducing breakage and raising head-rice/milling yield. (C) is NOT correct: gelatinized, denser parboiled rice actually takes more time to cook than raw rice, not less. The statement inverts the well-known effect.

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