Question

What is the test weight of 100 grains of rice?

• A. 30g
• B. 20g
• C. 25g
• D. 40g

Hint:

Remember that Test Weight = Weight of 1000 grains (used for small seeds like rice, \(25\text{ g}\)) and Seed Index = Weight of 100 grains (used for bold seeds).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
In seed technology and agronomy, "test weight" and "seed index" are important metrics used to evaluate grain quality, size, and boldness.
Strictly speaking, the test weight of a grain refers to the weight of 1000 grains for small-seeded crops like rice, wheat, and millets.
The phrasing of the question containing "100 grains" is a typographical error in the original question paper, which meant to ask for the standard 1000-grain test weight of rice.

Step 2: Detailed Explanation:
Let us define the seed-weight terminology:
1. Test Weight: The weight of 1000 seeds. This is used for small seeds like rice, wheat, and mustard where weighing individual grains is impractical.
2. Seed Index: The weight of 100 seeds. This is used for bold-seeded crops like bold maize, gram, and cotton.
For typical cultivated varieties of Rice (Oryza sativa), the weight of 1000 grains (test weight) is approximately 25 grams.
For basmati varieties of rice, which are much slender and lighter, the test weight is lower, around 21 grams.
For Wheat, the test weight is around 40 grams.
Therefore, aligning with standard textbook metrics, the value of 25g represents the standard test weight (1000-grain weight) of rice.

Step 3: Final Answer:
Thus, the test weight of rice is 25g.