Which of the following statements are contrary to each other as per traditional square of opposition?

A. All plants are oxygen producers.

B. Some plants are oxygen producers.

C. Some plants are not oxygen producers.

D. No plants are oxygen producers.

Choose the correct answer from the options given below:

This question was previously asked in
UGC NET Official Paper-I (Held On: 14 Mar, 2023 Shift 2)
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  1. B and C only
  2. A and D only
  3. A and C only
  4. B and D only

Answer (Detailed Solution Below)

Option 2 : A and D only
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UGC NET Paper 1: Held on 21st August 2024 Shift 1
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50 Questions 100 Marks 60 Mins

Detailed Solution

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 Key PointsIn the traditional square of opposition, there are four types of categorical propositions:

  1. Universal affirmative (All S are P)
  2. Universal negative (No S are P)
  3. Particular affirmative (Some S are P)
  4. Particular negative (Some S are not P)

The contrary pairs are those statements that have opposite truth values but have the same subject and predicate terms.

  • In this case, statement A "All plants are oxygen producers" is the universal affirmative proposition and statement D "No plants are oxygen producers" is the universal negative proposition.
  • These two statements are contrary to each other because if one of them is true, then the other must be false.
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