Give reasons why-
i. The amount of nitrogen gas remains same in inhaled and exhaled air.
ii. Fishes die when they are taken out of water.
iii. Carbon monoxide is a harmful gas.
iv. Mountaineers carry oxygen cylinder with them.
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1. The proportion of nitrogen gas in inhaled as well as exhaled air remains the same because nitrogen is neither used up nor produced in respiration
2. When fishes are taken out of the water, the supply of oxygen to the fish is reduced as they cannot respire using the oxygen present in the atmosphere. Thus, they will die when taken out of water.
3.Carbon monoxide is harmful when breathed because it displaces oxygen in the blood and deprives the heart, brain and other vital organs of oxygen
4.Mountaineers carry oxygen cylinders with them because in high altitudes atmospheric pressure is low which makes air less dense. This makes the volume of Oxygen for breathing very less.
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