Human Intervention In Nature-CBSE Oxford Class 8 Solution

Human Intervention in Nature – CBSE Oxford Class 8 Solution

In this chapter, students will learn how human activities influence natural phenomena. From deforestation and pollution to conservation efforts, this chapter explains the positive and negative impacts humans have on the environment. Our CBSE Oxford Class 8 solutions provide clear, easy-to-understand answers to all questions, helping students grasp concepts effectively and prepare confidently for exams.

Human Intervention in Nature-CBSE Oxford Class 8 Book Answers

Human Intervention in Nature-CBSE Oxford Class 8 Full Chapter Solution

Let’s Remember

Coal, petroleum, and natural gas are examples of fossil fuels.
Fossil fuels are non-renewable (renewable/non-renewable) energy sources.
Fossil fuels are used for generating electricity.
Coal contains carbon (arsenic/gold) metal.
Plant and animal waste is referred to as biogas/biomass.

1. Multiple Choice Questions

Which of the following is a renewable source of energy?
- a. Energy from fossil fuels
- b. Solar energy
- c. Biomass energy
- d. Both b and c
- Answer: d. Both b and c
Which of the following is an effect of deforestation on environment?
- a. Reduced rainfall
- b. Global warming
- c. Soil erosion
- d. All of these
- Answer: d. All of these
Which of the following will not result in imbalance of carbon dioxide and oxygen in the atmosphere?
- a. Planting trees
- b. Deforestation
- c. Burning of fossil fuels
- d. Increase in population
- Answer: a. Planting trees
Which of the following can be used to produce a cooking fuel widely used in rural India?
- a. Flowing water
- b. Energy of the wind
- c. Light energy
- d. Biomass
- Answer: d. Biomass
Energy derived from flowing water in water bodies is called hydroelectric energy.
Energy that is being used since ancient times to move ships, pump water, and grind corn is wind energy.

2. Fill in the Blanks with the Correct Words

Solar panels/cells convert solar energy into heat and light energy.
Biomass/Biogas is supplied via pipelines to houses for use as cooking gas.
Acid rain contains sulfuric/hydrochloric and nitric acids.
Renewable/Non-renewable energy sources can replenish themselves over a short period of time.
Desertification/Deforestation is a result of gradual erosion of soil that leads to loss of soil fertility.

3. Very Short Answer Questions

Give one word for the following.
- The continual degradation of forests due to natural or human-related causes: Deforestation
- Large-scale planting of saplings: Afforestation
- A greenhouse gas: Carbon dioxide
- Energy derived from flowing water: Hydroelectric energy
- Energy released by the splitting or merging together nuclei of atoms: Nuclear energy
Define the following terms: Deforestation, Afforestation, and Reforestation.
- Deforestation: The process of clearing forests for other land uses, such as agriculture or urbanization.
- Afforestation: The process of planting trees on land that has not been forested for a long period, or ever.
- Reforestation: The process of replanting trees in areas where forests have been cut down or damaged.
List four benefits of forests.
- Forests provide a habitat for living organisms.
- They help in maintaining the balance of oxygen and carbon dioxide in the atmosphere.
- They help to prevent soil erosion.
- They are a source of wood and other valuable products.
State any three effects of deforestation.
- Reduced rainfall
- Global warming
- Soil erosion
How are the roots of trees important?
- Tree roots hold the soil together, preventing soil erosion.
- They absorb water and nutrients from the soil.
- They anchor the tree, keeping it stable.
Name four air pollutants released due to burning of petroleum and coal.
- Sulfur dioxide
- Nitrogen oxides
- Carbon monoxide
- Particulate matter

4. Long Answer Questions | Human Intervention in Nature-CBSE Oxford Class 8

State any five practices that can help in conserving forests.
- Afforestation and reforestation
- Protecting forests from illegal logging and forest fires.
- Promoting sustainable forest management.
- Creating and maintaining national parks and wildlife sanctuaries.
- Reducing consumption of wood products and recycling paper.
Explain the major consequences of over-extraction of fossil fuels.
- Depletion of Resources: Fossil fuels are non-renewable and their over-extraction leads to their eventual exhaustion.
- Environmental Pollution: The burning of fossil fuels releases pollutants like sulfur dioxide, nitrogen oxides, and carbon monoxide, which contribute to air pollution and acid rain.
- Climate Change: The burning of fossil fuels releases large amounts of carbon dioxide, a greenhouse gas, which contributes to global warming and climate change.
- Habitat Destruction: The process of extracting fossil fuels, such as mining and drilling, can lead to the destruction of ecosystems and habitats.
- Economic Instability: Relying heavily on fossil fuels can lead to economic instability due to price volatility and geopolitical conflicts.
Describe any four renewable energy sources.
- Solar Energy: This is energy from the sun’s radiation, which can be captured using photovoltaic cells (solar panels) to generate electricity or as a source of heat.
- Wind Energy: This energy is harnessed from the kinetic energy of the wind using large turbines. These turbines turn a generator to produce electricity.
- Hydroelectric Energy: This type of energy is generated by the force of moving water, typically from rivers, which turns turbines connected to generators.
- Biomass Energy: This energy is derived from organic matter, such as plants, agricultural waste, and animal manure. It can be burned directly to produce heat or converted into fuels like biogas.

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In conclusion, Human Intervention in Nature-CBSE Oxford Class 8 helps students understand how human actions affect the environment. Studying Human Intervention in Nature-CBSE Oxford Class 8 encourages awareness of both harmful and beneficial impacts on natural phenomena. Our solutions for Human Intervention in Nature-CBSE Oxford Class 8 provide clear explanations for better learning and exam preparation. By referring to Human Intervention in Nature-CBSE Oxford Class 8, students can strengthen their knowledge and apply it to real-life situations.