Page 42 - EM BIOLOGY NOTES 10TH CLASS PSR DIGITAL BOOKS

10. NATURAL RESOURCES

Lesson related 1, 2, 4 marks
 Natural resources :- Materials present in large quantities and held in re- Activities Question and
serve for future use is called a resource. Resources present in nature are called videos Answers PDF
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natural resources. Ex : Air, Water, Soil, Plants, Animals, Fossil Fuels, Ores.
Natural resources :- These are two types.
1. Renewable resources 2. Non-renewable resources
1. Renewable resources :- After their use, renewable resources are generated or added
back to their source. Hence amount of resource remains constant in nature.
Ex : Air, Water, Sunlight, Forest, Soil.
2. Non-renewable resources :- After their use, non-renewable resources are not generated
or not added back to their source. Hence amount of resource remains decrease in nature.
Ex : Ores, Fossil Fuels.
 If the rate of use of Renewable resources exceeds the rate of which they are renewed, then
even renewable resources become Non-Renewable resources. Ex :- Forest.
We know that trees in forests used for fuel and for construction work in houses and indus-
tries for this purpose, trees in the forest are cut and the wood is used. It takes 15-20 years
or even more for a tree to grow. It has taken several hundreds of years for an area to
become a forest full of trees. If all the trees are cut for human activity in a period of one or
two years, there is not enough time for the trees to grow and the whole forest will disap-
pear soon - thus forest becoming a non-renewable resource.
 The population of human beings has grown enormously in the past two centuries. Billions
of people use up resources quickly as they eat food, build houses, produce goods and burn
fuel for transportation and electricity. The continuation of life as we know depends on the
careful use of natural resources.
 If we use resources carelessly many will be used up and they become as early as empty. If
we use wisely and efficiently however, renewable resources will last much longer. Through
conservation, people can reduce waste and manage natural resources wisely.
FOREST
 Forests serve as lungs for the world.
 They provide us innumerable products such as wood, medicine plants, fruits, honey, bam-
boo sticks ...
 Forests are a rich habitat for plants and animals.
 Deforestation destroys wild life.
 Increase soil erosion and decrease rainfall.
 Due to using wood as firewood greenhouses gases released into atmosphere, contributing
to global warming.
 De-forestation also harms the people who rely on forests for their survival, hunting and
gathering harvesting forest products.
 Sustainable forestry methods :-
 Sustainable forestry practices are critical for ensuring resources well into the future.
1. Harvesting with natural regeneration.
2. Avoiding certain logging techniques, such as removing all the high-value trees (or) all
the largest trees from a forest.
3. Trees can also be conserved if consumers recycle people in China and Mexico reuse
much of their waste paper including writing paper, wrapping paper and cardboard.
4. If half the world’s paper were recycled, much of the worldwide demand for new paper
would be fulfilled, saving many of the earth’s trees.

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