Which of the following statements are contrary to each other as per the traditional square of opposition?
1.All plants are oxygen-producers
2.Some plants are oxygen-producers
3.Some plants are not oxygen-producers
4.No plants are oxygen-producers
A2 & 3 only
B1 & 4 only ✓ Correct
C1 & 3 only
D2 & 4 only
Correct answer: (B) 1 & 4 only
Explanation
The two universal propositions, the affirmative All plants and the negative No plants, stand as contraries.
In the traditional square, contrariety holds between the A proposition and the E proposition.
Statement 1 is the A form and Statement 4 is the E form, both universal.
Contraries cannot both be true together, yet both may be false.
The particular forms (I and O) are subcontraries, not contraries.
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