Science Grade 6 B3 Practice #2

The weather conditions in a city have remained relatively uniform. The graphs show the monthly average temperatures and precipitation for 2020. In the city, which month in 2021 is likely to experience very warm weather and also

receive the highest amount of precipitation?

• April

• May

• June

• July

Which two processes show heat transfer through conduction?

• Steam from boiling water rises to the ceiling.

• A clothes drier heats clothes with hot air, causing water to evaporate.

• Hair twisted around a hot curling iron stays curled when the curling iron is removed.

• Air in an oven rises away from the hot base of the oven.

• An ice cube melts in a glass of water.

The map shows the position of the Sierra Nevada mountains and the prevailing wind direction. Which side of the Sierra Nevada mountains is likely to have a moist climate?

• East

• North

• South

• West

Humans cut down trees for building materials and to provide more open land for

buildings and farms. Laws have been created to replace forest land in an effort called reforestation. Which is a benefit of reforestation?

• It increases the amount of pollution.

• It restores animal and plant habitats.

• It increases the amount of water runoff.

• It reduces diseases in animal species.

Corals and algae both exist in the Great Barrier Reef off the coast of Australia. The

corals produce waste products that the algae use for photosynthesis. The algae

release oxygen, sugar, and other nutrients into the water that are absorbed by the

corals. Corals are harmed by increases in water temperature. The temperature of the

water around the Great Barrier Reef has increased steadily over the past several

decades.

How will the change in the water temperature likely affect the algae?

• The algae will start to prepare its own food from the Sun.

• The algae will lose resources and decrease in number.

• The algae will thrive by using fertilizer from the corals.

• The algae will leave the area and find a new host organism.

Corals and algae both exist in the Great Barrier Reef off the coast of Australia. The

corals produce waste products that the algae use for photosynthesis. The algae

release oxygen, sugar, and other nutrients into the water that are absorbed by the

corals. Corals are harmed by increases in water temperature. The temperature of the

water around the Great Barrier Reef has increased steadily over the past several

decades.

Which best describes the relationship between the corals and algae?

• predatory

• parasitic

• mutualistic

• competitive

The model shows an ocean current moving between Earth’s pole and equator. Which explanation describes the cause of water movement in oceans?

• Transfer of heat energy between the air and water causes ocean water to rise and fall.

• Transfer of ice particles between the air and water causes ocean water to move toward the

  equator.

• Water particles in the air force the water in the oceans to move toward the pole.

• Underwater mountains and the deep ocean floor force the ocean water to move up and down.

The diagram shows that the amount of available energy decreases from primary

consumers to tertiary consumers. Which is the likely reason for the decrease in the amount of energy?

• The amount of energy transferred between trophic levels decreases because energy is

  released as heat.

• The percent of energy lost as heat decreases from one trophic level to the next because

  energy is stored in organisms.

• The exposure of organisms to the Sun becomes limited from one trophic level to the next.

• The decreased body size of organisms reduces the energy needed in each trophic level.

Which are three goals of conservation?

• introduce new species to the environment

• maintain natural resources

• preserve biodiversity

• protect habitats and wildlife

• improve human technology

Which feature from Model 1 explains why the seasonal temperature changes of the coastal town are smaller than the rainforest town?

• The Andes Mountains cause inland temperatures to be unstable.

• The tropical rainforest causes heat to move from the middle of the continent to the coast.

• The Amazon River decreases the stability of rainforest temperatures.

• The Brazil current regulates the amount of heat along the coast.