Assertion (A) : Lock stitch is appropriate for stitching stretch fabrics.
Reason (R) : Lock stitch stretches with fabric stretch.
UGC NET - 2012,
Answer: D
A lock stitch is formed from two threads interlocked in the fabric, and the seam does not stretch, so the thread breaks when a stretch fabric is pulled. It is therefore not suitable for stretch fabrics, which need chain stitch, overlock or zigzag seams that give with the fabric. The assertion is wrong, and so is the reason, which says that lock stitch stretches with the fabric. So both are wrong, option (D). The other options each take one of the two statements as right.
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