Pakistan Prime Minister Imran Khan is being trolled on social media after he claimed in a speech that trees produce oxygen at night. At an event Khan said, "Darakht Raat mein oxygen dete hain (trees produce oxygen during the night)".

It is a well-established fact that most trees emit carbon dioxide (CO2) atnight.  This 15-second clip video clipthat has led to Twitter mocking Imran for claims that defy science was firstshared by Pakistani journalist Naila Inayat.

As the video went viral, some on Twitter couldn't help but question how an Oxford graduate could make such a mistake while others called him a scientist.

This is not the first time that the Pakistan prime minister has faced ridicule for statements that are in complete contrast to easily verifiable facts. Earlier, he was trolled when an old video of him saying Japan and Germany share a border went viral.