Which of the following is a source of harmful gas emissions?

Biology Mcqs for PPSC, FPSC, NTS, and Pakistan government job tests. Select an option below, then read the explanation.

PPSCFPSCNTSPakistan govt jobs
Subject
Biology Mcqsbiology-mcqs
Published
2 Jul 2021
Last updated
28 May 2026

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Choose the correct answer

Explanation

Among the listed options, automobiles (motor vehicles) are known to emit harmful gases such as carbon monoxide and nitrogen oxides, contributing to air pollution. Plants and bacteria do not produce harmful gases in this context.

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