Unit 1 Environmental Science

What is an dependent variable?

• What a scientist changes in an experiment to test their hypothesis

• What scientist measure to see if it responded to a change

• What happens when you do an experiment

• What you keep the same throughout all experimental groups

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Carmen conducted an experiment to determine if listening to different types of music would affect a
person’s pulse. Her hypothesis was that pulse rate would change with different types of music. Each
person listened to seven different selections of music for 30 seconds each. Each person’s pulse was
taken before the music and then after each 30-second interval of music. The pulses were taken again
after the music selections were completed. Based on her experiment, Carmen concluded that a
person’s pulse rate changed when the person listened to different types of music.

 

Which component is missing from Carmen’s experiment?

• a question

• a hypothesis

• a control group

• a description of the experiment

What percentage of energy is passed on to each tropic level?

• 10%

• 20%

• 25%

• 50%

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Which of the following illustrates the correct ordering of trophic levels?

• 
  decomposers-carnivores-autotrophs-herbivores

• herbivores-autotrophs-carnivores-decomposers

• autotrophs-herbivores-carnivores-decomposers

• carnivores-producers-omnivores

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The greatest number of individuals in a population that the environment can hold at that point in time

• greatest number of individuals in a population that the environment can hold at that point in time

• biotic potential

• carrying capacity

• exponential growth

Deforestation of areas considered to be rich sources of genetic material could limit future agricultural and medical advances due to

• the maintenance of dynamic equilibrium 

• 
  the loss of biodiversity

• an increase in the ecosystem’s carrying capacity

• the depletion of the ozone layer

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Which of the following are abiotic factors that shape ecosystems? 

• worms, plants and temperature

• wind, precipitation, and soil type

• niches, trees, and bacteria

• sunlight, mushrooms, and wind

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NGSS.MS-LS2-3

Succession is the process of change in a community:
*In primary succession the process starts with bare rock and its pioneer species are- 

• Weeds and Grasses

• Large Trees

• Lichen and Moss

• Soil

Invasive species such as lionfish and pythons can compete with the native species and have a direct effect on an ecosystems through a-

• decrease in biodiversity 

• no change in the ecosystem

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To reduce the effects of climate change we need to reduce the use of fossil fuels and rely more on any of the following except-

• wind power

• solar power

• Hydroelectric

• coal, oil and natural gas

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