Multiple choice

Which of the following is not a reason due to which multicellular organisms need more oxygen than unicellular organisms?

  1. The rate of respiration is much higher in multicellular organisms than in unicellular organisms.

  2. Multicellular organisms are made of billions of cells.

  3. Cells are not directly in contact with the environment or air.

  4. In blood, oxygen is slowly taken up by haemoglobin.

  5. The absorbed oxygen is rapidly transported to all the cells.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In multicellular organisms the blood oxygen is very quickly taken up by haemoglobin in the red blood cells making the process of diffusion faster.

Keep practicing — related questions