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Natural Resources
Other cycles Phosphorus is one of the building units of nucleic acids and ATP. Plants absorb this element in the form of ions. It is utilized for the synthesis of plant tissues. This element comes back to the soil and water by the decomposition of dead and decayed organic matter and excretory products. From there it is again absorbed by the plants. You have already studied how the O2 content is stabilised in the atmosphere. What about the quantity of water? How does the process of photosynthesis in plants, respiration and transpiration help in maintaining the cycle of O2 and water on the earth. Discuss and illustrate O2 and H2O cycles. Sulphur is another element essential for the formation of tissues in plants and animals. In nature, the flow of this element is also cyclic. You must have understood the role of biotic and abiotic factors in the flow of energy and matter. It is from these that natural resources are formed. They include energy, air, water, soil, minerals, plants and animals. You have already learnt that the natural resources could be divided in to renewable resources and non-renewable resources. Classify the different kinds of natural resources seen in your surroundings.
· Name the natural resources which are steadily increasing on the earth? How does it cause depletion of other resources? · 2/3 parts of the earth is water. How does this corroborate with media reports? · The depletion of plant resources can be compensated, but the depletion in the fossil fuels deposits cannot be compensated. Why? · It is realized that all types of natural resources are not renewable. It is also known that there is necessity of restricting the use of non-renewable natural resources also. What is the usual trend in using natural resources in your locality? Submit your data wise report after actively involving in a related project work.
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