Multiple choice

The excretory gases of plants are _______________________.

  1. CO2 and N2

  2. CO2 and O2

  3. N2 and H2

  4. O2 and N2

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Plants release carbon dioxide as a byproduct of respiration and oxygen as a byproduct of photosynthesis. Both gases are considered excretory products in the context of gas exchange.