(a) Percentage of carbon dioxide is more in inhaled air. (b) Fermentation occurs in the presence of oxygen. (c) Percentage of carbon dioxide is more in the exhaled air. (d) Fermentation occurs in the presence of carbon dioxide.(c) Percentage of carbon dioxide is more in the exhaled air.
Explanation:
The diagram shows a person blowing air (exhaling) into lime water. Lime water is a test for carbon dioxide. When CO₂ is bubbled through lime water, it reacts to form calcium carbonate, which turns the lime water milky.
This experiment is a classic demonstration used to show that exhaled air contains more CO₂ than inhaled air, as the lime water only turns milky after the person breathes into it, not before.
So, it helps to conclude that exhaled air has a higher concentration of carbon dioxide.
Observe (A) and (B) and select one characteristic that hold true for both of them. (a) Both are placed internally in the body of animal. (b) Both have thin and moist surface for gaseous exchange. (c) Both are poorly supplied with blood vessels to conserve energy. (d) In both the blood returns to the heart after being oxygenated.