Methane is produced by

  1. combustion of hydrogen
  2. nitrogen fixation
  3. photosynthesis
  4. cattle and rice paddies
Answer

D) cattle and rice paddies

Methane is a greenhouse gas from agriculture. O Level Biology · Topic 19 Relationships of Organisms with One Another and with the Environment · 19.4 Effects of humans on ecosystems

Biology MCQ · More O Level Biology: Organisms and the Environment MCQs · Practise