Multiple Choice
Identify the choice that best completes the
statement or answers the question.
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1.
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What effect would lowering dissolved oxygen levels in a pond have?
a. | The temperature of the pond would increase | b. | Fewer living animals
in the pond | c. | More living animals in the pond | d. | No effect |
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2.
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All of Earth’s different ecosystems make up the:
a. | biosphere. | b. | community. | c. | population. | d. | All of the
above |
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3.
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There are 20 ____ that can combine to make up proteins.
a. | nucleic acids | b. | amino acids | c. | carbon
compounds | d. | chemical reactions |
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4.
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Which of the following would be considered an ecosystem?
a. | The Sun | b. | Oxygen | c. | The Atlantic
ocean | d. | pH |
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5.
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The most abundant atoms in living organisms are:
a. | carbon, oxygen, and hydrogen. | b. | sulfur and nitrogen. | c. | carbon, oxygen and
nitrogen. | d. | oxygen and phosphorus. |
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6.
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A ____ is a group of two or more atoms joined together chemically.
a. | cell | b. | solution | c. | light
ray | d. | molecule |
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7.
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Energy units in a food pyramid:
a. | are actual numbers describing how many snakes are eaten by one
hawk. | b. | show relative amounts of energy that get transferred from a producer to a
consumer. | c. | must always be the same, even when the animals in the diagram
change. | d. | increase as you move up the food chain. |
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8.
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Which is the source of energy for most life on Earth?
a. | Plants | b. | Bacteria | c. | Water | d. | the Sun |
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9.
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This gas is a harmful pollutant when it reacts with water in the atmosphere to
make acid rain.
a. | Carbon dioxide | b. | Methane | c. | Mercury | d. | Sulfur dioxide |
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10.
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Mercury can be harmful to humans because:
a. | it builds up in the body and at high levels it may cause illness or
death. | b. | it can be stored in the fat of fish that people eat. | c. | fish may have levels
of mercury in their fat thousands of times greater than the level of mercury in the surrounding
water. | d. | All of the these |
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11.
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Animals that feed on other animals are known as:
a. | prey. | b. | predators. | c. | producers. | d. | decomposers. |
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12.
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Toxins are harmful to animals like humans because they:
a. | are concentrated at each link in the food chain. | b. | cannot be broken
down into less harmful compounds by the body. | c. | can damage tissue like the
brain. | d. | All of the above |
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13.
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An invasive species:
a. | competes with native species. | b. | may have a negative impact on native
species. | c. | may have no existing predators. | d. | All of the
above |
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14.
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A secchi disk is used to conduct a(n) ____ test in water.
a. | acid test | b. | pH test | c. | turbidity
test | d. | oxygen test |
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15.
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____ are made from smaller molecules called amino acids.
a. | Proteins | b. | Carbohydrates | c. | Lipids | d. | Starches |
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16.
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____ are energy-rich compounds, such as starch, glucose, and sucrose.
a. | Proteins | b. | Acids | c. | Carbohydrates | d. | Water molecules |
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17.
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An interaction where two species live together for a long time and at least one
of them benefits is called:
a. | competition. | b. | symbiosis. | c. | photosynthesis. | d. | abiotic. |
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18.
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This shows how each member of an ecosystem community gets its food.
a. | Food chain | b. | Water cycle | c. | Carbon-oxygen
cycle | d. | Water chain |
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19.
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Sugar molecules are present in:
a. | nucleic acids | b. | carbohydrates | c. | starch | d. | all of the
above |
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20.
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Animals that are killed by other animals for food are known as:
a. | prey. | b. | predators. | c. | consumers. | d. | decomposers. |
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21.
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The process of rearranging atoms in one substance into a new substance is called
a:
a. | production. | b. | chemical reaction. | c. | compound. | d. | solution. |
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22.
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Which of the following contains most of the water available to living
things?
a. | Rivers | b. | Fresh water lakes | c. | Oceans | d. | Glaciers |
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23.
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A(n) ____ is the simplest form of matter.
a. | cell | b. | element | c. | molecule | d. | compound |
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24.
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Ecosystems are:
a. | where organisms live. | b. | groups of living things and their physical
surroundings. | c. | only found on land. | d. | how energy is transferred from the sun to
Earth. |
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25.
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The most plentiful group in an ecosystem community are the:
a. | herbivores. | b. | carnivores. | c. | consumers. | d. | producers. |
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