In Incern plants, resistance against spotted aphids is linked to which of the following?

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Reduced levels of sinigen in the foliageElevated saponin concentration in the leavesIncreased DIMBOA presence in the leavesHigher content of silicon compounds

Explanation

Resistance to spotted aphids in Incern is primarily related to a high concentration of saponins in the leaves. Lower sinigen, increased DIMBOA, or elevated silicon levels are not the main factors contributing to this resistance.