6. MATCH THE FOLLOWING COLUMNS Column A Column B 1. Atmosphere (a) important component in water cycle 2. Nitrogen (b) moves a sail boat 3. Water vapour (c) thin layer of air around the earth 4. Respiration (d) important plant nutrient 5. Wind energy (e) food combines with oxygen to give energy H. HIGHER ORDER THINKING SKILLS (HOTS) 1. Why mountaineers carry oxygen cylinder while climbing high mountains ?
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High order thinking skills
Answer Atmospheric pressure is low at high altitudes. The volume of air increases and the air becomes less dense because the volume is inversely proportional to density. Hence, a lesser volume of oxygen is available for breathing. Thus, mountaineers have to carry oxygen cylinders with them.
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