Gas exchange or respiration takes place at a respiratory surface; a boundary between the external environment and the interior of the body. For unicellular organisms the respiratory surface is simply ...

Gas exchange occurs in the alveoli which are found in the lungs. Many spongy mesophyll cells are in contact with the air spaces, providing a large surface area for gas exchange to happen. The spongy ...

Here we are providing NCERT solutions for CBSE Class 11 Biology chapter – Breathing and Exchange of Gases. All these model solutions have been prepared by the subject experts. These solutions will ...

The cells in the body need oxygen to release energy from food efficiently by carrying out aerobic respiration. A waste product of aerobic respiration is carbon dioxide. The layer of moisture in the ...