8th Grade Science Unit 2 & 4 Quiz

Where do plants get most of the energy they need to live and grow?

• water

• soil

• air

• sunlight

Tags

NGSS.MS-LS1-6

In a food pyramid, which best explains why the number of organisms decreases from one trophic level to the next?

• Consumers at the lower level require more energy than the top-level consumers.

• Consumers at the top level require more energy than the lower-level consumers.

• The consumers are feeding on larger organisms that have less energy.

• The consumers are feeding on smaller organisms that have less energy.

Tags

NGSS.MS-LS2-3

Which best explains the role of plants in the carbon cycle?

• Plants take in carbon dioxide released by other organisms.

• Plants take in oxygen and release carbon dioxide.

• Plants take in carbon dioxide and pass it directly to animals.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

After decomposers break down decaying organisms, which directly uses the resulting nutrients?

• animals

• fossils

• plants

• the Sun

Tags

NGSS.MS-LS2-3

Which best describes how green plants obtain the carbon dioxide needed for photosynthesis?

• Carbon dioxide enters the plant through its roots.

• Carbon dioxide enters the plant through its leaves.

• Carbon dioxide is produced in the leaves using energy from the sun.

• Carbon dioxide is produced from stored food in the stem of the plant.

Tags

NGSS.MS-LS1-6

Which would be most affected by the absence of water?

• the transfer of pollen grains between flowers

• the metabolism of glucose during respiration

• the production of glucose during photosynthesis

• the release of waste products into the environment

Tags

NGSS.MS-LS1-6

Which best describes the role humans play in the oxygen cycle?

• They combine oxygen with other elements.

• They breathe in oxygen and carbon dioxide from the atmosphere.

• They breathe in oxygen and convert it to carbon dioxide, which they breathe out into the atmosphere.

• They breathe in carbon dioxide and convert it into oxygen, which they breathe out into the atmosphere.

Which level of a food chain has the most energy?

• producers

• decomposers

• scavengers

• consumers

Tags

NGSS.MS-LS2-3

Which best describes the role of nitrogen-fixing bacteria in the flow of energy?

• They convert carbon dioxide into nitrogen.

• They convert nitrogen into carbon dioxide.

• They convert sunlight and nitrogen into energy-rich sugar molecules.

• They convert atmospheric nitrogen into molecules that other organisms can use.

Tags

NGSS.MS-LS2-3

An energy pyramid is illustrated above. Which statement BEST explains the flow of energy as it moves through the different levels?

• Energy decreases as it is lost as heat to the environment.

• Energy increases as it is gained from the environment.

• Energy is unavailable because it is used up by the organisms at Level 1.

• Energy is transferred as it is produced by organisms in the next level.

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3