Question

Among the following, which unit operation is performed at the end of seed processing?

• A. Sorting
• B. Dressing
• C. Drying
• D. Conditioning

Hint:

Processing sequence: Pre-cleaning $\rightarrow$ Drying $\rightarrow$ Cleaning/Grading $\rightarrow$ Seed Dressing (Chemical Treatment) $\rightarrow$ Bagging.

Answer 1

The Correct Option is B

Step 1: Understanding the Concept:
Seed processing follows a strictly ordered technological sequence from receiving raw seeds to bagging certified, ready-to-plant seeds.

Step 2: Detailed Explanation:
The standard sequence of operations in a certified seed processing plant is:
1. Conditioning Pre-cleaning: Scalping and removing coarse impurities.
2. Drying: Lowering moisture to safe storage levels (\(8\text{--}12\%\)).
3. Cleaning and Grading (Sorting): Air-screen cleaner, gravity separator, and indented cylinders.
4. Seed Dressing (Treatment): Application of protective fungicides, insecticides, and colorants directly to the seed coat.
5. Packaging & Tagging: Bagging into commercial sacks.
Seed dressing is the final chemical unit operation before packaging.

Step 3: Final Answer:
Therefore, the operation performed at the end of seed processing is Dressing, corresponding to option (B).