Question

1. Which of the following bodies of water can cleanse itself from a moderate level of water pollutants? Lakes Streams Groundwater All the above are correct A and Care correct 16-Which of the following is a strategy to use water more sustainably? Regulate withdrawal to prevent depletion of renewable aquifers Slow the rate of ozone depletion Build more dams Increase productivity in livestock production 13. Most water is withdrawn from surface waters and aquifers for Drinking water Industrial manufacturing Cooling power plants a Irrigation of crops 18. What is the most abundant clement present in the troposphere, other than oxygen? Nitrogen Carbon dioxide Water vapor Argon 19. Which of the following statements is (are) considered as a disadvantage of building dams? . Providing water for drinking Production of cheap electricity Disruption of migration of some fish . All the above are disadvantages provided by dams Only A and B are disadvantages provided by dams 2. The air inside homes and buildings is always cleaner and safer than the air outdoors. True False 21. Where in the atmosphere do we normally find greenhouse gases? Troposphere Stratosphere Mesosphere Thermosphere 23. What human activity causes greenhouse gases? .Using mobiles Burning fossil fuels Riding bikes Purifying water

Answer 1

35- Streams

Flowing streams can recover from moderate level of water pollution if they are not overloaded with pollutants and their flows are not reduced.

In a flowing stream,the breakdown of degradable wastes by bacteria depletes dissolved oxygen and creates an Oxygen sag curve.