Download Man Affects - Different Branches of Biology - Lecture Slides and more Slides Biology in PDF only on Docsity! Man affects his Environment
through the change of:
Land Use
meee Pollution
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Docsity.com Monoculture • increase in pest population ∵monoculture enables pests to have continual supply of food • exhaustion of particular type of minerals ∵the same type of plants draws particular types of mineral from the soil for a long time Effects on Environment : Docsity.com Definition: Any undesirable change in the environment caused by Human Activities Docsity.com Smoke & Exhaust Fumes Domestic Wastes Agricultural Wastes Industrial Wastes Noise Docsity.com ∗ Carbon Dioxide • accounts for Greenhouse Effect • causes melting of polar ice ⇒ increases in sea level ⇒ causes flooding of cities Docsity.com ∗ Carbon Particles : Environmental Effect: cover plants & make them unable to carry out gaseous exchange & photosynthesis Health Effect: cause respiratory diseases ∗ Lead : from cars Health Effect: affect mental development of baby & child, cause headache, irritability, fatigue & depression Docsity.com ∗ Sulphur Dioxide & Nitrogen Dioxide Environmental Effect: produce acid rain which is corrosive to buildings and plants & fish are unable to survive in acidic conditions Acid rain Acid leaching Acid snow Dry fallout Die off of aquatic life SO2 & NOx H2SO4 & HNO3 Docsity.com Detergents – Environmental Effect: create foam on surface, decrease oxygen content in rivers, living organisms suffocate & die increase phosphate ions, cause algal bloom (eg. red tides) – affect the functioning of sewage treatment plant by killing micro-organisms which the treatment depends Docsity.com Agricultural Wastes Inorganic Fertilizers – Environmental Effect: cause rapid growth of algae (e.g. red tides) use up lots of O2 in water fish & other organisms die from suffocation Docsity.com Manure – Environmental Effect: decomposers increase rapidly due to sufficient food supply O2 content in water decreases cause suffocation of fish & other organisms Docsity.com Crude Oil (from wrecked tankers) – Environmental Effect: ◊ cover sea surface which reduces light penetration and dissolve O2 amount ◊ stick feathers of birds, making them unable to fly Docsity.com Noise Sources – domestic – industrial – constructional – traffic Effects: – Health Effect: causes psychological stress, irritation, nervous fatigue, ear less sensitive & even deafness Docsity.com Why we need Conservation ? ∵ rapid growth of population has led to increase in demand for land & thus destruction of natural habitat Docsity.com Sewage Treatment Sedimentation – settle down solid substances to form sludge Decomposition – aerobic respiration of microorganisms in aeration tank by bubbling air in order to oxidize organic compounds into inorganic compounds Docsity.com Sewage Treatment Fermentation – microorganisms in digester to carry out anaerobic respiration produce methane gas can be used as fuel to drive the sewage treatment plant – dry sludge can be used as fertilizers Docsity.com • Legislation – control the amount of pollutants discharged • Education – by mass media (besides normal schooling) • Birth control – to decrease the stress on resources Ways of Conservation Docsity.com
