Life Science
What does a plant cell's nucleus do?
A. It contains most of the cell's internal parts.
B. It gives rigid structure to the plant cell.
C. It is the control center of the cell.
D. It produces energy for the cell.
C. It is the control center of the cell.
Which of the following is a way that humans can prevent erosion?
A. making new buildings C. building highways
B. planting new plants and trees D. paving land
B. planting new plants and trees
What is a closed circuit?
A. an interrupted path of electricity
B. a circular path that electricity is unable to travel through
C. the complete path of an electrical current
D. a connection of components which prevents electricity from flowing
C. the complete path of an electrical current
What tool could help a biologist study the movements of cells?
A. a television with a remote control
B. digital camera with a zoom lens
C. a satellite with a digital camera
D. a microscope with a video camera
D. a microscope with a video camera
Which of the following best describes microorganisms?
A. Most microorganisms are harmful to humans because they are only found in water and in soil.
B. Microorganisms are the most dangerous when they are in fungus form.
C. Most microorganisms are not harmful, and many are actually beneficial.
D. All microorganisms are harmful because they act as parasites.
C. Most microorganisms are not harmful, and many are actually beneficial.
What is common among all living things?
A. leaves
B. cells
C. teeth
D. bones
B. cells
A severe storm would be most likely to damage a coastal area by causing ___________.
A. earthquakes C. volcanoes
B. erosion D. pollution
B erosion
Which of the following is an example of static electricity?
A. a plastic stick rubbed with wool attracts rice grains
B. a flashlight is turned on using a switch
C. a battery-powered toy robot starts to move
D. a computer cord is plugged into an outlet
A. a plastic stick rubbed with wool attracts rice grains
What class of vertebrate animal is being described?
~breathes air with lungs
~have scales or plates
~lay eggs
A. fish B. bird C. mammal D. reptile
D. reptile
Where can you find cells that each have a cell wall, a nucleus, and chloroplasts?
A. in animals
B. in plants
C. in both animals and plants
D. Those cells cannot be found
B. in plants
Microorganisms are almost everywhere on planet Earth, but they are too small to see. Some microorganisms cause diseases. But other microorganisms are helpful, and play roles in _______.
A. creating water C. providing sunlight
B. decomposition D. melting snow
B. decomposition
Thousands of years ago, a river flowed across a flat plain, What force caused the deep canyon that the river flows in?
A. deposition by ocean waves C. erosion by ocean waves
B. deposition by moving water D. erosion by moving water
D. erosion by moving water
Which of the following is an example of a physical change?
A. an egg being cooked on a stove
B. a chocolate bar melting on a hot day
C. cake batter being baked in an oven
D. a slice of bread turning brown in a toaster
B. a chocolate bar melting on a hot day
A cell has many structures inside it. All of these structures are held in the cell by its covering. What is this covering called?
A. nucleus
B. chloroplast
C. cell membrane
D. cytoplasm
C. cell membrane
Knowing how to swim is an ____________ that a fish has. This means that a fish can begin swimming right after it hatches from an egg.
A. acquired trait
B. a learned skill
C. instinct
D. a learned behavior
C. instinct
Invertebrates are animals that ___________________.
A. have fur or hair
B. have a backbone
C. have gills or scales
D. do not have a backbone
D. do not have a backbone
Jordan notices that the bottom of a cliff is worn away. Why is the cliff worn away the most near or under the level where the water is?
A. because the moving water is what wears away the cliff
B. because fish and animals who live in the water tear up the cliff
C. because the cliff is softer beneath the water line
A. because the moving water is what wears away the cliff
Which of the following is an example of a chemical change?
A. an egg being cracked open
B. a chocolate bar melting on a hot day
C. cake batter being baked in an oven
D. water changing to ice
C. cake batter being baked in an oven
An elephant is taught how to stand on its hind legs on command. What type of trait is this?
A. a skipped trait
B. an inherited trait
C. a lost trait
D. a learned trait
D. a learned trait
Lyle's brother and sister have a fever and a sore throat. A few days later, Lyle also gets a fever and a sore throat. It is likely that Lyle's illness __________________.
A. cannot be spread to another person.
B. will go away if he washes his hands.
C. was caused by microorganisms entering his body.
D. was caused by microorganisms in his body being killed.
C. was caused by microorganisms entering his body.
Flowering plants use flowers, which produce pollen and eggs, to reproduce. Many non-flowering plants, such as ferns and mosses, ___________.
A. use spores to reproduce
B. use cones to reproduce
C. also use flowers to reproduce
D. use fruit to reproduce
A. use spores to reproduce
A seismological study finds that there will likely be a large increase in the number of earthquakes occurring in a certain area. What action would most likely be taken to control the damage that could occur?
A. Action would be taken to prevent the earthquakes from occurring
B. Buildings in the area would be designed to withstand the earthquakes.
C. Roads in the area would be altered so people travel around the area.
B. Buildings in the area would be designed to withstand the earthquakes.
When would an electromagnet stop working?
A. An electromagnet would stop working when it cools below 45°F.
B. An electromagnet would stop working when the electric current is interrupted.
C. An electromagnet would stop working after 24 hours.
D. An electromagnet would stop working when it gets sunlight.
B. An electromagnet would stop working when the electric current is interrupted.
Which of the following describes an example of current electricity?
A. A student feels a shock when she touches a doorknob after walking across a carpeted surface.
B. A battery connected to a motor in a toy car allows the car to move.
C. A lightning bolt produces sound and light.
D. A balloon sticks to the wall after being rubbed with a piece of wool.
B. A battery connected to a motor in a toy car allows the car to move.
Which of these is required to make a circuit?
A. two batteries
B. a closed loop
C. a light bulb
D. static electricity
B. a closed loop