In the following question, a sentence is divided into numbered parts. Identify the part that contains a grammatical error. Sentence: “Our digestive system produces an assimilable, nutrient rich liquid that builds and nourish our first body tissue, plasma.”

Introduction / Context:
This question tests knowledge of subject verb agreement and parallel verb forms in a complex sentence. The sentence talks about what the digestive system produces and how that product affects body tissue. The examinee must decide which numbered part of the sentence contains an error, or whether the sentence is completely correct.

Given Data / Assumptions:

• The complete sentence reads: “Our digestive system produces an assimilable, nutrient rich liquid that builds and nourish our first body tissue, plasma.”
• Part (1) would normally contain “Our digestive system produces an assimilable, nutrient rich liquid”.
• Part (2) would contain the clause “that builds and nourish our first body tissue”.
• Part (3) would contain the word “plasma” and punctuation.
• The subject of the relative clause “that builds and nourish” is “liquid,” which is singular.

Concept / Approach:
The key grammar concepts here are subject verb agreement and parallelism. When a singular subject is followed by two verbs joined by “and,” both verbs should match the singular subject in form. Since “liquid” is singular, both verbs after “that” must be singular in form. Therefore, both should end in “s” in the simple present tense. Any mismatch between the two verbs indicates an error.

Step-by-Step Solution:

Verification / Alternative check:
We can rewrite the sentence correctly to check: “Our digestive system produces an assimilable, nutrient rich liquid that builds and nourishes our first body tissue, plasma.” In this corrected version, both verbs are singular and parallel. There is no structural or meaning issue in parts (1) and (3), so the only error is in part (2). The identification is therefore confirmed.

Why Other Options Are Wrong:

• Part (1): The phrase “Our digestive system produces an assimilable, nutrient rich liquid” is grammatically correct and clear.
• Part (3): The phrase “our first body tissue, plasma” is a correct appositive construction that renames the tissue as plasma.
• “No error”: This option is wrong because we have clearly identified an error in subject verb agreement in part (2).

Common Pitfalls:
Many learners focus only on the first verb after the relative pronoun “that” and ignore the second verb. Another frequent mistake is to think that the plural looking verb “nourish” is acceptable because of the plural idea of “builds and nourish.” However, what matters is the number of the subject, not the number of verbs. When two actions are performed by a single subject, both verbs must agree with that one subject. Forgetting parallelism when two verbs share the same subject often leads to errors.

Final Answer:
Part (2) is the correct answer, because the verb “nourish” should be “nourishes” to agree with the singular subject “liquid” and to maintain proper parallelism.