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Questions and Answers
What is a primary consequence of deforestation?
Which phenomenon is caused by the overflow of water exceeding the carrying capacity of channels?
What effect can heavy siltation in dams cause?
What is a consequence of pesticide use on pest populations?
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What is one of the aims of conservation?
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Which issue is commonly associated with the overuse of pesticides?
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What ecological imbalance can result from the persistent use of pesticides?
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Which of the following is a consequence of environmental pollution?
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What is a cause of floods mentioned in the context of environmental effects?
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What does the term 'super pest' refer to?
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What is one potential long-term effect of pesticide use on agricultural ecosystems?
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Which option describes a method of conservation?
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What can be an effect of prolonged downpour?
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Pesticide-related problems can lead to which of the following outcomes?
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How can excessive pesticide usage impact fish populations?
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What is one of the main problems related to the evolution of genetic resistance in pests?
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What effect do pests like insects, bacteria, and viruses have on plants?
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What is one primary cause of reduced food production mentioned?
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How does overgrazing primarily affect the land?
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What are renewable energy sources characterized by?
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What happens to the root stocks of good quality grasses and herbs during overgrazing?
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Which of the following is a consequence of soil erosion?
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What is indicated by the term 'alternate energy sources'?
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What is one noted factor contributing to hunger in the world?
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Study Notes
Environmental Issues Related to Agriculture and Food Resources
- Field washout leads to algal blooms and accumulation of dead organic matter, affecting water quality.
- Re-vegetating mined areas with suitable plant species helps increase biodiversity while promoting gradual restoration of flora.
- Decomposition of organic matter increases oxygen demand in bodies of water, impacting aquatic life.
- Prevention of toxic drainage is crucial to mitigate negative environmental impacts.
Problems Associated with Pesticide Use
- Pesticides can lead to the evolution of genetic resistance in pests, complicating crop management.
- Pesticide use causes imbalances in ecosystems, creating new pests and impacting beneficial organisms.
- Human activities disturb the mobility of toxins, which can harm aquatic life when washed into rivers and streams.
Overgrazing and Its Consequences
- Overgrazing leads to land degradation, characterized by soil erosion and loss of useful plant species.
- Soil becomes compacted and loses organic content, rendering it unsuitable for cultivation.
- Modern agriculture practices often involve the use of high-yield crop varieties, resulting in micronutrient imbalances and nitrate pollution.
Water Management Challenges
- Water logging occurs when soils become saturated with excess irrigation or rain, raising the water table and blocking oxygen supply to roots.
- Salinization results from prolonged water logging, harming plant growth by accumulating salts in the soil.
- Eutrophication caused by nutrient run-off leads to depleted oxygen levels in water bodies, harming aquatic ecosystems.
Global Food Issues
- Key challenges include under-nutrition, malnutrition, and vulnerability to natural calamities like famine, drought, and floods.
- Pest damage contributes significantly to food insecurity, as 60% of the world’s food production is at risk from pests.
Energy Resources and Their Importance
- Population growth and industrial demands drive the need for diverse energy sources, with fossil fuels accounting for 95% of energy production.
- Renewable energy sources, such as solar, wind, and hydroelectric power, can be generated continuously and are sustainable.
Overgrazing and Land Degradation
- Overgrazing destroys vital vegetation and root systems, leading to the proliferation of secondary plant species that lack nutritional value.
- Persistent land degradation transforms soil into a dry, compact state, limiting agricultural potential and biodiversity.
Environmental Effects of Deforestation
- Deforestation leads to resource destruction, heavy siltation of dams, and contributes to soil erosion and biodiversity loss.
- It exacerbates global warming and ecological imbalances by increasing atmospheric CO2 levels.
Conservation Strategies
- Conservation involves strategies such as afforestation, reforestation, and disease control to preserve natural habitats.
- Restraining tree cutting and promoting healthy forest ecosystems are critical for maintaining biodiversity.
- Conservation efforts must account for the impacts of environmental changes such as flooding and soil fertility loss.
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Description
Explore the challenges of mined area restoration and the consequences of pesticide use in this quiz. Learn about algal blooms, oxygen demand from decomposition, and the evolution of genetic resistance in pests. This quiz covers crucial aspects of environmental science and ecology.
