Discussion
Thrips have asymmetrical mouth parts due to absence of
Answer: B
Thrips mouthparts are asymmetrical because the right mandible is absent.
Thrips have rasping-sucking mouthparts in a cone. Only the left mandible develops, as a stylet used to pierce the plant surface; the right mandible is reduced or lost during development. The paired maxillary stylets then suck up the sap from the damaged cells, which gives the silvery streaks typical of thrips damage.
It is the left mandible that is present, so 'Left mandible' is wrong, and since one mandible remains, 'Both' is also wrong. 'None of these' does not apply because the absence of the right mandible is the reason.
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