Science 5: Unit 8 (In Perfect Balance)

A regular pattern of change is called a _____ .

• cycle

• weather

• season

Bacteria that can change nitrogen into compounds can be found in ________nodules on plants.

• stem

• root

• leaves

The year is divided into _____ , one of the earth’s cycles.

• weather

• climate

• seasons

The water cycle includes precipitation, transpiration, _________, and condensation.

• rain

• evaporation

• snow

People and animals breathe in oxygen and breathe out carbon dioxide during ________.

• respiration

• photosynthesis

• transpiration

During respiration organisms use _______molecules and oxygen to produce energy.

• sugar

• carbon dioxide

• sunlight

How is a drought different from other natural disasters?

• Drought does not have a definite beginning or ending.

• Natural disasters does not have a definite beginning or ending.

What is one problem that invasive species can bring to an ecosystem?

• increased number of predators of a native species;

• diseases;

• increased competition for food and water

• ALL

After coming back from an overseas trip, there are inspectors at the airport checking things that passengers are bringing from other countries. One inspector will not let a woman keep a potted plant. Why is she not allowed to bring the plant into the country?

• The plant may be an invasive species that could cause harm to ecosystems. The plant may bring in disease or insects that could cause harm.

• The inspector is suspecting the woman to be a terrorist she doesn't want the woman to bring plant from their countries that can cause harm to the country.

What is/are the ways people can reduce the effects of manmade stresses on an ecosystem?

• replant trees; set land aside as a wildlife refuge or national park;

• build artificial wetlands to replace drained ones

• prevent

  pollution; make laws to control fishing and hunting

• ALL