Question

click or tap on any mixed constructions in the following passage. if the passage doesn’t contain any mixed constructions, click the “no errors” button.
the cactus plant is native to north america and south america. historically, native americans have used parts of cacti to survive. cactus plants can be eaten whole; parts of the cactus can be served raw, baked, or candied. the reason for the sap was used during religious ceremonies.
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Explanation:

A mixed construction error occurs when a sentence starts with one grammatical structure and then shifts to another incompatible one. In the sentence "The reason for the sap was used during religious ceremonies", the phrase "The reason for the sap" is an incorrect structure. It should be either "The sap was used during religious ceremonies" (removing "the reason for") or rephrased to fit a "reason... is that" structure, like "The reason the sap was used during religious ceremonies was...". So this sentence has a mixed construction.

Answer:

The mixed construction is in the sentence: "The reason for the sap was used during religious ceremonies."