Multiple choice

Which one of the following statements is correct?

  1. All animals require a medium for cellular respiration.

  2. In all the animals, oxygen is transported by haemoglobin of the blood.

  3. All animals take oxygen from water or air through gills or lungs only.

  4. All animals need oxygen for respiration.

  5. Alveoli of lungs have columnar epithelium.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Exchange of gases requires a definite medium. For eg.,  in mammals exchange of gases takes place in alveoli of lungs.

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