Environmental issues class 12 pdf. NCERT Solutions’ PDF, CBSE Class 12 Biology, Chapter 16 2019-01-07
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CBSE Revision Notes for class 12 Biology
These notes will certainly save your time during stressful exam days. Over half of e-waste of developed world are exported to developing countries mainly China, India, Pakistan where metals like copper, iron, silicon, nickle and gold are recovered during recycling process. The fertilizers, pecticides and weedicides are being sprayed over the crops. Organic Farming Integrated organic farming is a cyclic, zero-waste procedure in which waste products from one process are cycled in as nutrients for other processes to allow the maximum utilization of resource and increase the efficiency of production. What are the various constituents of domestic sewage? Dry deposition :- If acid settled on earth surface through solid dust particles with nitrate or sulphate, this is called dry deposition. In iron mill disease due to iron dust - Siderosis. Domestic Sewage and Industrial Effluents- The sewage that comes out from house and office makes the domestic sewage.
NCERT Solutions Class 12 Biology Chapter 16 Environmental Issues
Smog causes damage in rubbers. Pollution is undesirable change in physical, chemical or biological properties of air, land, water or soil. The growth of plants is inhibitated or reduced due to this type of pollution and sometime their death also take place. However, an increase in the amount of greenhouse gases can lead to an excessive increase in the Earth's temperature, leading to global warming. Due to disposal of all kinds of waste and other anthropogenic actions the ponds, lakes ,stream, river, estuaries and oceans are becoming polluted in several parts of world.
NCERT Solutions for Class 12 Biology Environmental issues
At the beginning of the twentieth century, forests covered about 30% of the land of India. It consists of paper, food wastes, plastics, glass, metals, rubber, leather, textile etc. With increasing population, and repeated cultivation, this recovery phase is done away with, resulting in deforestation. They embraced the trees and lost their lives at the hands of soldiers of the king. Waterlogging and soil salinity are some of the problems that have come in the wake of the Green Revolution. The fertility of soil is reduced due to growing of plants again and again.
NCERT Solutions’ PDF, CBSE Class 12 Biology, Chapter 16
It is a fine powder of recycled modified plastic which is mixed with the bitumen. Ecological sanitation is a sustainable system for managing human excreta, using dry composting toilets. In slash and burn agriculture, the farmers cut down the trees of the forest and burn the plant remains. You can also find Environmental Issues, Chapter Notes, Class 12, Biology ppt and other Class 12 slides as well. The following reasons are responsible to minimise the fertility power of soil in nature.
View PDF CBSE Class 12 Biology Environmental Issues (2)
The raw material for creating Polyblend is any plastic film waste. Discuss the role of women and communities in protection and conservation of forests. These electrons attach to dust particles giving them a net negative charge. Discuss the effects of sewage discharge on a river. This chapter deals with the problems that are posing a threat to the ecological balance in nature such as pollution, global warming, deforestation, etc. Which would be difficult or rather impossible to reduce? It causes aging of skin, damage to skin cells and various types of skin cancers.
It also causes skin darkening and skin cancer. How will enhanced ultraviolet Radiations affect us? Integrated Waste Water Treatment Wastewater including sewage can be treated in an integrated way, by combining artificial and natural processes. Protection or conservation foresty : By making national park and Biosphere Reserve. Kyoto protocol conference held in Kyoto Japan for climate change 1997. The native people in collabaration with Humboldt State University created an integrated waste water treatment process within a natural system. Similarly, the lead to skin cancer, sterility and poorer eye sight. Chlorofluro Carbons deplete the ozone layer.
The low velocity air is provided between the plates which allow the dust to fall. For the control of this pollution, lime ferric chloride, etc. How will enhanced ultraviolet Radiations affect us? Environmental Issues Environmental Issues Pollution is the undesirable change brought about by chemical, particulate matter, or biological materials to air, water, or soil. After tertiary treatment, the wast-water can be discharged into natural water sources or used for irrigation. The cleaning occurs in two stages — a the conventional sedimentation, filtering and chlorine treatments are given. The lapse in concentration during the studies is something very similar to online shopping. Biodegradable pollutants - The domestic sewage papers, woods, garbage, live stock wastes, etc.
The important part of exam preparation and the key to success, as the more you revise these notes. In this, trees are cut and plant remains in the forest are burned since the ash acts as a fertilizer. Strontium-90 is radioactive element which causes Leukamia and bone cancer. Third pollution or land scape pollution : To make Fertile-land barren by dumping wastes. In a scrubber, the exhaust is passed through a spray of water or lime. The important part is that with this composting method, human excreta can be recycled into natural fertiliser.
