If an organism consistently failed to synthesise adequate amino acids, its metabolism inevitably degrades.
Show answer & explanation
Correct answer: B
Explanation
The sentence describes a general scientific fact or a universal truth. In English grammar, such statements are expressed using the Zero Conditional or the First Conditional.
Grammatical Consistency (Tense):
The second part of the sentence uses the present tense: "...its metabolism inevitably degrades."
To maintain consistency within the sentence, the first part (the "if" clause) should also be in the Simple Present Tense.
Option ‘B’ follows the above structure.
The underlined part of the sentence should be changes by “consistently fails to synthesise”.