Discussion
Assertion (A): A screw press cannot recover all the oil from an oilseed.
Reason (R): Mechanical pressure alone leaves five to eight per cent oil in the cake.
Select the correct answer from the options below.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason is the mechanism. A press works by squeezing, and squeezing cannot empty a cellular structure: some oil is held in unbroken cells and some by capillary forces in the compressed mass, leaving 5 to 8 per cent in the cake.
Solvent extraction does not have this limit, because it dissolves the oil rather than expelling it mechanically, and reaches below 1 per cent. The gap between the two figures is exactly what makes pre-press solvent extraction worthwhile for a high-oil seed.
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