Which statement best describes a bacterial cell?
a. It contains more than one cell.
b. It is a complete organism.
c. It is part of a larger organism.
d. It contains different kinds of cells.
b. It is a complete organism.
100
Which are examples of inherited traits?
a. specific beliefs
b. fingerprints
c. memories
d. nose shape
d. nose shape
100
Which best describes the speed of a ball as it is thrown straight up into the air and comes back down?
a. the ball goes up at a constant speed, stops, then comes down at a constant speed.
b. the ball goes up at a constant speed, stops, and increases speed as it comes down.
c. the ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
c. the ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.
100
After a rain, a puddle of water remains on a sidewalk. After a day of sunshine, the puddle is gone. Which process is most responsible for the disappearance of the puddle?
a. precipitation
b. transpiration
c. evaporation
d. condensation
c. evaporation
100
In a grassland ecosystem, if the population of eagles suddenly decreased, what will most likely be the effect on the rest of the ecosystem?
a. the ecosystem will become overpopulated with snakes.
b. there will be a decrease in the population of snakes in the ecosystem
c. the nutrition in the soil in the ecosystem will decrease.
d. more types of plants will begin growing in the ecosystem.
a. the ecosystem will become overpopulated with snakes.
200
Which characteristic do single-celled organisms and multicellular organisms have in common?
a. both have cells with specialized functions for each life process.
b. both perform all life processes within one cell.
c. both have a way to get rid of waste materials.
d. both are able to make food from sunlight.
c. both have a way to get rid of waste materials.
200
A litter of kittens have traits that are similar to both the mother cat and the father cat. Which best explains this situation?
a. the kittens are provided the same kind of milk form their mother as they grow.
b. the kittens inherit some of their traits form their mother and some from their father.
c. the kittens are kept at the same temperatures b their mother when they are first born.
d. the kittens are taught by their parents to have similar traits.
b. the kittens inherit some of their traits form their mother and some from their father.
200
What can cause a moving object to increase its speed in a forward direction?
a. a force pushing on the object to increase its speed in a forward direction.
b. a force that continually acts on the object in the direction the object is moving.
c. an increase in the mass of the object
d. a decrease in the mass of the object
b. a force that continually acts on the object in the direction the object is moving.
200
Which best describes a characteristic of the jet stream?
a. It forms a boundary between a cold air mass and a warm air mass.
b. It creates the high winds around the eye of a hurricane.
c. It forces the hot air along the equator to rise to areas in North America.
d. It causes high pressure air masses to rotate clockwise
a. It forms a boundary between a cold air mass and a warm air mass.
200
Which process allows green plants to control the amount of water stored in their leaves?
a. photosynthesis
b. condensation
c. respiration
d. transpiration
d. transpiration
300
Which system of the human body provides protection to most of the major organs?
a. skeletal system
b. circulatory system
c. respiratory system
d. muscular system
a. skeletal system
300
What is the cause of rising surface temperatures of the Pacific Ocean, drought in the western United States, and flooding on the Pacific coast of South America?
a. the Gulf Stream
b. the jet stream
c. La Nina
d. El Nino
d. El Nino
300
A student uses a rubber band to launch the four objects shown below.
Object Mass
paper clip 0.5 gram
piece of paper 1 gram
eraser 2 grams
rubber ball 10 grams
If the student pulls the rubber band back the same amount each time, which object will most likely move the fastest when launched?
a. paper clip
b. piece of paper
c. eraser
d. rubber ball
a. paper clip
300
On a cold, cloudy day, the local weather forecaster predicts that a high pressure system will be moving into the area in the next 24 hours. Which weather conditions will this system most likely bring to the area?
a. stormy
b. sunny
c. snowy
d. hot
b. sunny
300
Which is an example of a decomposer?
a. a hawk
b. a mouse
c. a flower
d. a mushroom
d. a mushroom
400
Which example best shows structures that make up the digestive system in the human body?
a. heart, blood, vessels
b. nose, trachea, lungs
c. brain, spinal cord, nerves
d. esophagus, stomach, intestines
d. esophagus, stomach, intestines
400
Which best explains why children resemble their parents?
a. they eat the same foods
b. they have similar DNA
c. they speak the same language.
d. they have the same interests
b. they have similar DNA
400
A pencil falls off a desk. What move the pencil toward the floor?
a. mass
b. friction
c. gravity
d. speed
c. gravity
400
What must occur before clouds can form?
a. water vapor must get warmer
b. water vapor must lose heat energy
c. precipitation must begin to fall and run off
d. transpiration must add water vapor to the atmosphere
b. water vapor must lose heat energy
400
As more people have moved to the beach, the sea turtle population has decreased. Which is most likely the cause of this decrease?
a. tropical storms
b. increase in predators
c. habitat loss
d. warmer temperatures
c. habitat loss
500
A scientist is trying to decide whether an organism is unicellular or multicellular. Which information would help the scientist most to make her decision?
a. size of the cells of the organism
b. what the organism eats
c. how many types of cells are in the organism
d. how fast the organism grows
c. how many types of cells are in the organism
500
Which is a characteristic of a dog that is most likely a result of its environment?
a. its color
b. its length of ears
c. its food preference
d. its ability to see in the dark
c. its food preference
500
A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is most responsible for causing the wagon to stop?
a. gravity acting on the wagon
b. friction acting on the wagon
c. the mass of the wagon
d. the mass of a child
b. friction acting on the wagon
500
The weather forecast indicates that a warm front will be moving into the area in the next 24 hours. Which type of weather will most likely result?
a. clear skies and cold temperatures
b. clear skies and hot temperatures
c. cloudy skies and rainy weather
d. heavy snow and ice
c. cloudy skies and rainy weather
500
Which will most likely cause a decrease in predator populations?
a. an increase in prey populations
b. a decrease in prey populations
c. a decrease in decomposers
d. an increase in producers