EC-6 Science Practice Test

Which plant adaptation is most common in an arctic biome?

The correct answer is plants that grow in snow grow low to the ground and produce flowers quickly. Snow covers arctic biomes much of the year and there is a short growing season so the plants must have adaptations that allow for this type of climate.

Which of the following is the best insulator of heat?

foam cooler. Foam is an insulator that blocks the transfer of energy.

The graph above shows global temperature changes from 1861-1991. Using this map what is the logical prediction of the trend of global temperatures in the next decade?

the temperature will continue to rise. Although the graph shows a decline in temperatures at times, there has been a steady increase over the last 130 years, so that is the best answer.

Which of the following would not be a result of deforestation of a large tract of land?

Decrease in the amount of carbon dioxide in the air is the correct answer because during the process of photosynthesis plants used carbon dioxide to produce food so they reduce the amount of CO2 in the air, the amount of CO2 would increase in areas of deforestation. Oxygen amounts would decrease because photosynthesis produces oxygen, deforestation destroys habitats, and soil erosion would increase because plants lessen erosion by holding soil in place with roots.

A student wants to test the hypothesis that larger magnets have greater force than smaller magnets. What is the next step the student should take to test the hypothesis?

Design an investigation that includes at least one independent variable that changes in the experiment.

The Carbon-Oxygen Cycle is an exchange of gasses that are given off by plants and animals. Which is the best explanation of this cycle?

The correct answer is plants need carbon dioxide for photosynthesis and animals need oxygen for respiration. Plants use carbon dioxide in a process known as photosynthesis. During photosynthesis, plants give off oxygen as a waste product. Animals give off carbon dioxide as waste and use oxygen for respiration.

Which statement most effectively describes how the Jet Stream affect weather patterns in the United States?

The correct answer is the jet stream is responsible for transporting weather systems that affect us. The two jet streams that directly affect our weather in the continental US are the polar jet and the subtropical jet. They are responsible for transporting the weather systems that affect us. The polar front is the boundary between the cold North Pole air and the warm equatorial air.

Which substance occurs in all three states of matter naturally on the earth?

The correct answer is water. Water occurs in nature as water vapor which is gas, liquid water, and ice its solid form

We live in this layer of the atmosphere and weather also occurs here. This layer is the . . .

Troposphere

Which agent of weathering and erosion causes the greatest change to Earth's surface?

Water

Which of the following is an example of a solution?

Water and sugar

Which of the following statements best defines transpiration?

Water that evaporates from plants such as grass and trees.

All the processes listed below change the Earth's surface. Which of the following causes the slowest change to Earth's surface?

Weathering

Which of the following is an example of an inherited behavior in animals?

a newly hatched snake playing dead. Playing dead is an instinct or inherited behavior.

Which characteristic identifies an organism as a reptile instead of an amphibian?

Reptiles have scales, shields, or plate, and amphibians skin is smooth and moist.

Which type of rock is formed from cementation and compaction of sediment?

Sedimentary

A teacher is preparing a lesson for students to help students learn the scientific method. Which of the following examples would be the most effective way for students to learn this?

Students planning and completing an investigation to find out if sunlight is necessary for plants to grow.

Incomplete metamorphosis is different than complete metamorphosis because animals that go through incomplete metamorphosis do not:

The correct answer is go through a pupa or chrysalis phase. Animals that go through incomplete metamorphosis hatch from an egg looking like a miniature of the adult without wings, which grow later after several moltings.

Which of the following do NOT carry out photosynthesis?

Animals

Which of the following shows a chemical change and not a physical change?

-paper being torn into pieces -Burning wood (CORRECT) -ice melting -crushing a can

A student is finding the mass of a stone on a triple beam balance. The stone has a mass of 563 grams. Which of the following is equivalent to 563 grams?

0.563 kg

A class is investigating whether the length of the string affects the rate a pendulum swings. The teacher explains during this investigation that the students will need to perform repeated trials. Which of the following is the best reason for the teacher to require repeated trials?

Repetition ensures that the experiment is valid and that the data is reliable.

Which of the following DO carry out photosynthesis?

Algae, plants, and some bacteria

Animals that live in dark environments like, the Texas Blind Salamander, do not have eyes, instead they have eyespots. This would be considered an example of:

An adaptation

Which of the following is a true statement?

An adult Siberian tiger's fur turns white in the winter, so it's offspring's fur will also turn white in winter.

Renewable resources provide sustainable energy that reduces pollutants released into the atmosphere. Which of the following is an example of a renewable energy source, also called alternative energy?

Biofuel

Over the past century, there has been an increase in Greenhouse gas emissions or air pollutants in the atmosphere. Which of the following has caused this increase of pollutants?

Burning coal to produce electricity.

The human body changes which type of energy to mechanical energy to produce body movement?

Chemical

In a flashlight, which type of energy transformation occurs?

Chemical energy to electrical energy to light energy

This describes the general temperature and precipitation patterns over time.

Climate

Which best demonstrates the use of an inquiry based activity during a unit on forces of motion?

Experimenting to see if changing the height of a ramp affects the distance a toy car travels.

A student is using a hot plate to boil water in a glass beaker for an experiment. Which type of safety equipment is most important for this experiment?

Heat resistant gloves

Energy from the sun is needed for which of these cycles to continue? I Rock cycle II Water cycle III Carbon Dioxide-Oxygen Cycle IV Cell cycle

II &III II Water cycle III Carbon Dioxide-Oxygen Cycle

You are riding a bike on a straight level street. Why does the bike go slower and slower and eventually stop after you stop pedaling? I. Gravity causes the bike to stop II. There are no forces acting on the bike to move, so it stops. III. Spring forces cause the bike to stop. IV. Friction is a stopping force that is acting on the bike, so it slows and stops.

II and IV are correct - There are no forces acting on the bike to move, so it stops. -Friction is a stopping force that is acting on the bike, so it slows and stops.

Natural satellites, or moons, orbit larger bodies. The larger the celestial body the greater the number of natural satellites. Which planet in our solar system has the most natural satellites?

Jupiter

A meadow food chain is shown above. Which of the following would most likely occur in the community of organisms after a wildfire?

Meadow plants would decrease and rabbits would decrease.

A student is measuring how far a toy car travels down a ramp. Which of the following tools would the student select to measure the distance the toy car has traveled?

Measuring tape

Which of the following equipment is necessary to identify unicellular animals found in pond water?

Microscope, eyedropper, and slides.

Which of the following would you include as part of lesson to promote healthy choices?

Playing outside or exercising at least 60 minutes per day.

Why does the earth experience seasons?

The earth is tilted on its axis.

Which is the best explanation for why we experience day and night?

The earth rotating on its axis once every 24 hours.

Why do the objects in the solar system orbit around the sun?

The larger the object the greater amount of gravity.

In a pond, the primary producer is green algae called Spirogyra. The primary consumer is a small crustacean, called a Fairy Shrimp. The secondary consumer is a small bluegill fish and the larger tertiary consumer is a smallmouth bass. What changes will occur if pesticides in the water kill off the Fairy Shrimp?

The smallmouth bass population will decrease.

Of the following student activities, which would help students overcome their misconceptions that the earth's shadow causes the phases of the moon?

The students will use a ball and a flashlight to build a model of the Earth, Sun, and Moon. The flashlight is the sun, the student will be the Earth and the ball will represent the moon. As the ball revolves and rotates around the Earth the students will view the changes in the moon.

Why does the moon have more craters than the earth?

There is little tectonic plate movement and lack of atmosphere means no weathering to cause weathering or erosion on the surface.

Reflection is light rays bouncing off a shiny surface and refraction is when light rays bend when they pass through different mediums. Which of the following statement gives an example of reflection and refraction?

sunglasses are an example of reflection and prescription eyeglasses are an example of refraction. Sunglasses reflect the sunlight and prescription lenses refract light to correct vision. Anything with a lens—cameras, telescope, and even the human eye refract light.