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Motion
What measures one should take to maintain the fertility of the soil?
Following are the measures that one should take for maintaining the fertility of the soil :
(i) Crop rotation - which ensures efficient use of nutrients by all the plants.
(ii) Growing of leguminous plants as one of the crop which increases the nutrient content of the soil by fixing nitrogen.
(iii) Leaving the soil uncultivated for one or two seasons.- This helps the soil to regain its richness.
(iv) Using manure - Being organic in nature it impreoves the fertility and quality of the soil.
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You have seen weather reports on television and in newspapers. How do you think we are able to predict the weather?
We know that many human activities lead to increasing levels of pollution of the air, water-bodies and soil. Do you think that isolating these activities to specific and limited areas would help in reducing pollution?
Write a note on how forests influence the quality of our air, soil and water resources.
What are the two things which are essential for all forms of life on the earth?
What is biosphere?
What are the physical components?
What is biotic component?
Does there exist any relationship between the climate and biotic components? If yes, explain with example.
What percentage of oxygen and nitrogen is present in the air?
Name the pollutants by which industries pollute air.
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