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Each of the following items in this section consists of a sentence, the part of which have been jumbled. These parts have been labelled as P, Q, R and S. You are required to re-arrange the jumbled parts of the sentence and mark your response accordingly.

P: scientists say they have developed a new

Q: illnesses such as heart disease and cancer

R: DNA tool that uses machine learning to accurately

S: predict people's height and access their risk for serious

This question was previously asked in
CDS I 2019 Elementary Mathematics Previous Year Paper (03-Feb-2019)
The correct answer is

P R S Q

Rearranging Jumbled Sentence Parts: P R S Q

The question asks us to rearrange four parts of a sentence, labelled P, Q, R, and S, into a coherent and grammatically correct sentence. Let's look at the parts:

  • P: scientists say they have developed a new
  • Q: illnesses such as heart disease and cancer
  • R: DNA tool that uses machine learning to accurately
  • S: predict people's height and access their risk for serious

We need to find the logical flow of these parts to form a complete thought. Let's try connecting them.

Part P seems like a good starting point as it introduces the subject ("scientists") and an action ("say they have developed a new").

P: scientists say they have developed a new...

What have they developed? R describes what was developed: "DNA tool that uses machine learning to accurately". So, P followed by R makes sense.

P R: scientists say they have developed a new DNA tool that uses machine learning to accurately...

What does this tool accurately do? S describes the function: "predict people's height and access their risk for serious". R is followed by an action verb ("accurately predict"), which matches the beginning of S. So, R followed by S is logical.

P R S: scientists say they have developed a new DNA tool that uses machine learning to accurately predict people's height and access their risk for serious...

Risk for what? Q provides the specific examples of risk: "illnesses such as heart disease and cancer". S ends with "risk for serious", which is naturally followed by the types of illnesses in Q.

P R S Q: scientists say they have developed a new DNA tool that uses machine learning to accurately predict people's height and access their risk for serious illnesses such as heart disease and cancer.

This sequence P R S Q forms a complete and grammatically correct sentence. Let's examine each connection:

  • P to R: "a new" is followed by the type of new thing, "DNA tool". This is a valid noun phrase connection.
  • R to S: "accurately" is followed by the verbs it modifies, "predict people's height and access...". This adverb-verb connection works.
  • S to Q: "risk for serious" is followed by the type of serious risks, "illnesses such as...". This noun phrase connection is correct.

The sentence "scientists say they have developed a new DNA tool that uses machine learning to accurately predict people's height and access their risk for serious illnesses such as heart disease and cancer" flows logically and is grammatically sound.

Comparing this order P R S Q with the given options, we find that it matches option 1.

Revision Table: Sentence Rearrangement Practice

Reviewing the process helps improve skills in sentence rearrangement.

Key steps:

  • Identify the likely starting part (often introduces the subject).
  • Look for connections between parts (e.g., noun followed by verb, adjective modifying noun, phrase completion).
  • Read the proposed sentence aloud to check for flow and grammar.
  • Consider subject-verb agreement and pronoun references.

Additional Information: English Sentence Structure

Understanding basic English sentence structure is key to rearranging jumbled parts. A typical sentence includes:

  • Subject: Who or what the sentence is about.
  • Predicate: What the subject is doing or is. This often includes a verb and objects or complements.

In the correctly arranged sentence:

  • Subject: "scientists"
  • Predicate: "say they have developed a new DNA tool that uses machine learning to accurately predict people's height and access their risk for serious illnesses such as heart disease and cancer."

Within the predicate, "they have developed a new DNA tool" is the main clause, followed by a relative clause ("that uses machine learning...") and further descriptive phrases explaining the tool's function and the risks it assesses.

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