Human Impacts and Conservation

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

• Carbon dioxide
• Water vapor
• Methane
• Nitric oxides

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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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Advantages of reintroduction programs include:

• Ceases human-wildlife conflict

• Increased opportunity for eco-tourism

• Impacts entire eco-systems

• Impacts one species only

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In the 1800s rabbits were introduced for the first time into Australia. Here they had no natural predators and a plentiful food supply. What happened several years after the rabbit was introduced into Australia?

• The rabbits began to overpopulate greatly.

• Populations of animals competing with rabbits grew.

• The rabbit population declined sharply.

• New rabbit predators evolved.

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A toxin that breaks down slowly is introduced into the environment through the spraying of insecticides. The toxin is very lethal when an organism receives high levels of it. Which organism in the food web is in the most danger?

• Grass

• Rabbit

• Fox

• Fish

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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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Which trophic level in a food web would accumulate the LEAST amount of a toxin, such as methylmercury or DDT?

• autotrophs
• primary consumers 
• herbivores
• secondary consumers 

The advantages of ex-situ conservation include:

• Raises awareness

• Increases genetic diversity

• It's cheaper than in-situ conservation

• Contributes towards research

Humans have been using increasing amounts of land to build houses and construct roadways. Which statement below describes how this expansion affects organisms from these areas?

• Species are quickly adapting to new habitats and different niches

• The loss of habitat is reducing the population size of other animals

• Carnivores are being forced to eat vegetation in lieu of meat

• Animals are developing new habits that compliment human life

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Which of the following is NOT associated with a loss of biodiversity?

• increased ecosystem stability
• extinctions
• loss of natural resources 
• loss of potential foods & medicines 

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