Discussion
Assertion (A): Sphericity of a flat seed approaches unity.
Reason (R): Sphericity compares an equal-volume sphere's surface area with the particle's own.
Select the correct answer from the options below.
Answer: A
Correct answer: A is false but R is true
The reason states the definition correctly:
\[ \Phi = \frac{A_{\text{sphere, equal volume}}}{A_{\text{particle}}} = \frac{(LWT)^{1/3}}{L} \]
The assertion, however, is the opposite of what that definition gives. A flat seed has one dimension much smaller than the others, so the geometric mean \( (LWT)^{1/3} \) is well below \( L \) and sphericity is low - often 0.3 to 0.5. Sphericity approaches unity only for a nearly spherical particle such as a pea or a mustard seed. A true reason with a false assertion again.
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