IGCSE Biology Paper-4: Specimen Questions with Answers 235 - 237 of 279

Passage

Deforestation occurs in many parts of the world.

Question 235 (1 of 4 Based on Passage)

Edit

Write in Brief

One Liner▾

State two reasons why deforestation is carried out.

Explanation

Reasons Deforestation is Performed

Agriculture, Unsustainable forest management, Mining, Infrastructure projects etc.

Question 236 (2 of 4 Based on Passage)

Edit

Write in Brief

One Liner▾

Describe two effects deforestation can have on the soil.

Explanation

The effects of tree loss on soil are significant. Trees and shrubs shield the ground from the force of raindrops and provide shade that reduces surface soil temperature, which in turn reduces evaporation. Logging and small-scale removal of trees exposes soil to rain splash which loosens and dislodges soil particles, eroding soil and creating a more impermeable bare surface, which increases runoff.

Question 237 (3 of 4 Based on Passage)

Edit

Write in Brief

One Liner▾

Explain the effects deforestation can have on the carbon cycle.

Explanation

Deforestation influences the Carbon Cycle also known as the Greenhouse gas effect and global warming. Trees and forest balance the amount of Carbon in the atmosphere through the process of photosynthesis in which plants make their own food with carbon dioxide. When there is an access amount of carbon dioxide in the atmosphere a ‘blanket’ of carbon dioxide is created and this ‘blanket’ traps heat and prevents it from leaving the earth surface in the atmosphere. This excess heat warms the earth. If there is too much of it and this causes Global Warming and the heating of the earth.

Developed by: