Conservation of Resources and Pollution — BIOLOGY STD 8 — Question
ICSE BoardEnglish MediumSTD 8BIOLOGYConservation of Resources and Pollution3 Marks
Question
Define the term ‘natural resources’ with examples.
✓
Answer
Substances and sources of energy found in the nature $($lithosphere, hydrosphere and atmosphere$)$ that are used by human for supporting life, are called natural resources. Soil, air and water are some of our natural resources. Natural resources are classified into two categories.
$(i)$ Renewable resources
$(ii)$ Non$-$renewable resources
Renewable resources : These are resources that have the capacity to get replaced by quick recycling through natural cycles. Oxygen in the air is a renewable resource, because it is replaced by plants during photosynthesis. Soil, water, wildlife and forests are the main renewable resources. However, these resources might exhaust if used too rapidly due to improper management and to not get enough time for renewal.
Non$-$renewable resources : These are resources available in limited amounts. These resources once used cannot be replaced within a reasonable time span. Fossil fuels like coal, petroleum, metals, minerals and natural gas are non$-$renewable resources. Similarly, top soil takes hundreds of years to form Most of these resources once used are lost forever. Some non-renewable resources, such as metals can be used again and again since they can be recycled.
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