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List any three human activities which wo...

List any three human activities which would lead to an increase in `CO_2` in air.

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MBD -HARYANA BOARD-OUR NATURAL RESOURCES-Example
  1. What are the different states in which water is found during the water...

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  2. Name two biological important compounds that contain both oxygen and n...

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  3. List any three human activities which would lead to an increase in CO2...

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  4. What is greenhouse effect ?

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  5. What are the two forms of oxygen found in the atmosphere?

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  6. Why is the atmosphere essential for life?

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  7. Why is water essential for life?

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  8. How are living organisms dependent on the soil ? Are organisms that li...

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  9. You have seen weather reports on television and in newspapers. How do ...

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  10. We know that many human activities lead to increasing levels of pollut...

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  11. Write a note on formation of soil.

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  12. What are the effects of use of fertilizers and pesticides for long per...

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  13. What are the effects of use of fertilizers and pesticides for long per...

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  14. Why is soil as resource important for mankind ? Mention the constituen...

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  15. Define soil fertility. How can it be maintained ?

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  16. What is air pollution ? Write the main sources and preventive measures...

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  17. Write a few properties of water. Sketch water Cycle.

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  18. What is nitrogen cycle ? Make a simple line sketch to show nitrogen cy...

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  19. Briefly explain oxygen cycle.

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  20. Briefly explain carbon cycle in nature.

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