igcse biotechnology and human and environment

Increase in which gas is primarily responsible for increased global warming?

• Carbon dioxide
• Water vapor
• Methane
• Nitric oxides

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When fertilizers run off farmland into streams and ponds, the nitrogen content of the water increases. This can lead to rapid growth of algae in a process called eutrophication. How can this process affect other organisms in the water?

• Oxygen is used up as algae is decomposed, reducing the amount available to other organisms.
• The water becomes better able to support aerobic organisms.
• The algae provide food for fishes and other organisms, leading to decreased algae populations.
• The extra nitrogen provides additional food for the other organisms, increasing their population.

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What is the most dramatic result of deforestation?

• land is no longer green and full of life
• pictures from space show deforestation
• loss of habitat for approximately 70% of the worlds species
• people can't explore rainforests

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The natural resources used by society are limited by various factors. Why is coal considered a nonrenewable resource?

• Once coal is used up, it can never be replaced.
• Coal is a nonrenewable resource, because it comes from the impact of meteors with the Earth
• Coal was a renewable resource, until it was mismanaged by humans
• Coal is considered a nonrenewable resource, because it takes millions of years to form

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Fossil fuels are an important natural resource used by society. Which of the following best describes fossil fuels?

• They are any liquid fuel derived from once-living matter.
  
• They are organic fuels derived from ancient plants and animals.
• They are fuels in which dinosaur fossils are commonly found.
• They are naturally occurring inorganic fuels like coal and petroleum.

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What is one way a drought changes an environment?

• animal habitats are flooded
• plants have more room to grow
• beaches wash away
• animals migrate in search of water

Which of the following is a human activity that affects the environment in a helpful way?

• recycling paper 
• creating pollution 
• cutting down trees
• creating landfills

If organisms cannot adapt to changes, sometimes the enitre group dies out. This is called _______? 

• decompostion 
• extinction 
• adaptation 
• migration 

Which are most closely related to biotechnology?

• medicine and agriculture

• construction and engineering

• water treatment and electricity generation

• communication and information technology

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Which use of biotechnology most benefits North Carolina agriculture?

• producing human vaccines

• producing disease resistant crops

• producing new medicines from bacteria

• producing enzymes to eliminate pollutants

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