Science Unit 3 Lesson 17

The body of a polar bear is able to withstand extreme cold. Temperatures of 50 degrees Fahrenheit can be too warm for them.

Could a polar bear survive in another, very warm ecosystem?

• No, the polar bear could not meet its need for colder temperatures.

• No, the polar bear could not reproduce in warmer temperatures.

• Yes, the polar bear would lose fat layers and adapt to warm temperatures.

• Yes, the polar bear could survive in cooler, shadier areas.

  Yes, the polar bear could survive in cooler, shadier areas. - no response given

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Maple trees are found in areas that receive 76 to 152 centimeters of precipitation yearly. They take up water from the soil through their roots. Water is then transported throughout the tree.

Could a maple tree survive in a desert area which gets less than 23 centimeters of rain per year?

• No, the maple tree could not extend its roots into the desert soil.

• No, the maple tree could not meet its need for water in a desert.

• Yes, the maple tree could adapt to storing more water like a cactus.

• Yes, the maple tree could adapt by spreading its roots closer to the surface to soak up any rain.

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Koalas have adapted to eat only eucalyptus leaves that are native to Australia. Because these plants are toxic there is very little competition for this food source.

Would koalas be able to survive if moved from their Australian habitat to a deciduous forest?

• Yes, they would be able to adapt to eating other, similar foods.

• Yes, they would adapt and learn to compete for other food and resources.

• • 
    

    No, their food source would not be available and they may not be able to compete for other food.

• No, they would not be able to find nesting materials for their young.

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What are the characteristics of a healthy ecosystem?

Select each correct answer.

TWO correct answers

• 
  

• Many species are able to meet all of their needs.

• A single species is able to meet all of its needs and quickly reproduce.

• There is a healthy and stable web of life.

• New species are able to take over resources and reproduce quickly.

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What are the characteristics of a healthy ecosystem?

Select each correct answer.

TWO correct answers

• Many species are able to interact and meet all of their needs.

• Only one species is able to meet all of its needs.

• Only the strongest species successfully compete for resources.

• Populations stay at stable levels.

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What criteria do scientists use to identify healthy ecosystems? 

Select each correct answer.

TWO correct answers

• Stronger species successfully compete for resources and survive.

• Many species are able to meet their needs.

• Populations stay at stable levels.

• New species that are introduced quickly compete for available resources.

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What best describes an invasive species? TWO correct answers

• a new species that is introduced to an ecosystem and causes harm

• An invasive species is not native to the ecosystem and causes harm.

• An invasive species is from another country and grows well in a new area.

• a species in an ecosystem that competes with many species for resources

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Fill in the blanks. Kudzu is a plant native to Asia. It was brought to the southeast United States where it grew very _____________. In its new home, Kudzu ________________ resources such as food, water, and sunlight. It ______________ native species in the environment.

• slowly, adapts, makes room for

• quickly, competes for, crowds out

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Fill in the blanks. Wild pigs are _____________________ that were introduced from Europe. They eat almost everything and _________________ native wildlife for food resources. The pigs also destroy _______________, another food source, as they trample over the land. They have no natural _________________, and females reproduce about ten times in their lifetimes.

• invasive species, compete with, vegetation, predators

• native species, shares, habitats, friends

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Fill in the blanks. Water hyacinth is a plant that was introduced to lakes where it grew very ________________. it _______________ resources such as sunlight and nutrients. Over time ,it ____________________ existing native species.

• quickly, competes for, crowds out

• slowly, complements, shares

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