Which of the following is a disadvantage of afforestation?
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Trees lock up carbon dioxide
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Newly planted trees prevent other plants from getting water
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Trees prevent windblown sand moving to form sand dunes
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Trees become a source of firewood that will be used in stoves by local people
Q.2.
Which of the following is a human cause of desertification?
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Increased flock and herd size
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Seasonal rainfall being unreliable
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Climate change
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Certain crops going extinct
Q.3.
Magic stones are a project in which piles of stones are placed across slopes. How do these help reduce desertification?
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The stones prevent soil blowing away by holding it down
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The stones slow surface water run-off and soil erosion
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The stones stop goats and other grazing animals destroying the vegetation
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The stones remind people that the soil needs to be protected
Q.4.
How can rainfall be made more reliable in areas under threat from desertification?
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Better weather forecasting
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Damming of rivers
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Better crop selection
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Cloud Seeding
Q.5.
Which of the following is a possible strategy to reduce desertification?
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Havesting branches rather than complete trees for fire wood
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Controlled burning of grasslands to reduce the spread of wildfires
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Reducing the number of livestock animals
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Developing national parks and reserves where local people aren't permitted
Q.6.
In areas under threat from desertification, people are forced to use marginal lands. How are these marginal lands defined?
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Lands along the edges of a desert or a lake
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Lands that form the boundary between two tribal areas. Grazing here can lead to tribal conflict
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Lands that have little or no potential for profit. They often have poor soils or other undesirable characteristics
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Lands that are at the edges of cities and may be heavily contaminated
Q.7.
Dams have been built on a number of major rivers to increase the amount of water available for drinking and agriculture. How can artificial irrigation increase desertification?
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It causes rapid soil erosion
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It causes salinisation of the soil
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It causes soil contamination
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It causes sheet erosion
Q.8.
Which of the following is a physical cause of desertification?
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Overgrazing
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Irrigation
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Changing farming practices
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Climate change
Q.9.
Which of the following is a way that planting trees will help reduce desertification?
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By acting as a wind-break to reduce the amount of sand being blown away
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By producing water as rainfall in the immediate area
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By providing a source of sustainable fuel
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By protecting the remaining soil and allowing a leaf litter layer to develop
Q.10.
How can plant science help increase the amount of vegetation in areas and so slow, or even reverse desertification?
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By developing or discovering more drought resistant versions of crops such as millet and cotton
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By creating new crops from varieties such as algaes and cactus
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By changing the ground in specific ways to suit the water-intensive crops that are required
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By developing treatments and medicines to help the crops survive times when there is little water
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