Câu hỏi ôn tập về nạn phá rừng

What is the main harmful effect of deforestation?

• Increasing the number of forests

• Producing more oxygen

• Climate change and damage to animal habitats

• Decreasing soil erosion

Answer explanation

The main harmful effects of deforestation are climate change and damage to animal habitats

Why do commercial farms clear forests?

• To protect biodiversity

• To grow crops like soy and palm oil

• To prevent soil erosion

• To increase rainfall

Answer explanation

Huge commercial farms have taken over large areas of forest in many countries. In Indonesia, for example, industrial logging is carried out to clear huge areas for the production of palm oil, while in Brazil, large areas of the Amazon rainforest are cleared to grow soy and vegetable oil

How long does it take for cleared land to recover in normal conditions?

• 2 years

• 5 years

• 10 years

• 20 years

Answer explanation

Trees help hold soil together and absorb excess rainwater. Without them, the top layer of soil is washed away, leading to floods.

What is one major effect of deforestation on the atmosphere?

• It increases carbon dioxide levels

• It reduces oxygen production

• It prevents the greenhouse effect

• It decreases global temperatures

Answer explanation

Normally, tropical rainforests help control the Earth’s temperature by absorbing carbon dioxide. However, in areas where deforestation has taken place, the carbon dioxide goes into the atmosphere and traps heat in a process called the greenhouse effect.”

How does deforestation affect biodiversity?

• It increases the variety of plants and animals

• It causes habitat loss and species extinction

• It protects endangered species

• It prevents pollution

Answer explanation

Deforestation causes the loss of habitats and damage to land where plants and animal species live, leading to the extinction of many species.

Explain how deforestation contributes to climate change.

Answer explanation

-Trích dẫn từ bài: “Normally, tropical rainforests help control the Earth’s temperature by absorbing carbon dioxide. However, in areas where deforestation has taken place, the carbon dioxide goes into the atmosphere and traps heat in a process called the greenhouse effect. The result is global warming.”

• Lời giải: Trees absorb carbon dioxide, a greenhouse gas. When forests are destroyed, this gas remains in the atmosphere, trapping heat and leading to global warming.

Why does continuous land reuse lead to soil erosion?

Answer explanation

-Trích dẫn từ bài: “This constant reuse of land leads to heavy erosion – the loss of the top layer of soil which protects the ground. Erosion, in turn, can cause flooding in heavy rain.”

• Lời giải: When land is continuously used for farming without giving it time to recover, the topsoil, which protects the land, is lost. This weakens the soil structure, making it prone to erosion and flooding.

What is the role of rainforests in absorbing carbon dioxide? What happens when they are cut down?

Answer explanation

-Trích dẫn từ bài: “The vast rainforest of the Amazon covers an area around 2.5 times the size of the UK and absorbs an estimated 1.36 billion tonnes of carbon dioxide annually. However, in areas where deforestation has taken place, the carbon dioxide goes into the atmosphere and traps heat.”

• Lời giải: Rainforests play a crucial role in absorbing carbon dioxide. When they are cut down, the stored carbon is released, increasing greenhouse gases and contributing to climate change.

Why is biodiversity important, and how does deforestation threaten it?

Answer explanation

-Trích dẫn từ bài: “A decrease in biodiversity threatens entire ecosystems and destroys future sources of food and medicine.”

• Lời giải: Biodiversity ensures ecosystem stability and provides resources like food and medicine. Deforestation destroys habitats, leading to species extinction and ecosystem imbalance.

Suggest some actions that governments should take to prevent deforestation.

Answer explanation

-Trích dẫn từ bài: “Looking to the future, governments should act to plant more trees which will absorb carbon dioxide and protect forests from illegal logging.”

• Lời giải: Governments should implement reforestation projects, enforce strict laws against illegal logging, and promote sustainable land-use practices.