Standard Science Primary 5 Systems

Which of the following correctly describes the air we BREATHE OUT compared to the air we breathe in?

A Less oxygen, more carbon dioxide
B Only carbon dioxide
C More oxygen, less carbon dioxide
D Only nitrogen
Show Worked Solution

Worked Solution

Step 1: Our bodies use oxygen and produce carbon dioxide as waste. Step 2: Exhaled air contains less oxygen (used by cells) and more carbon dioxide (waste removed). Step 3: Correct answer is B.

Correct answer: Less oxygen, more carbon dioxide

Want more questions like this? Superholic Lab has 10,000+ MOE-aligned questions with full worked solutions.

Start Free Trial — 7 Days Free