7th Grade Pre-Test

Why does the troposphere have the greatest amount of atmosphere pressure? 

• it produces the ozone layer
• it has the highest temperatures
• it contains a high concentration of gas particles
• it is the region in which weather occurs

If the motion of an object is increased, which type of mechanical energy was gained by the object? 

• chemical energy
• potential energy
• kinetic energy
• electromagnetic energy

Which best describes the energy of the ball? 

• its energy is lost once it falls off the shelf
• its energy depends upon the speed the ball will travel
• it has mechanical energy in the form of potential energy
• it has mechanical energy in the form of kinetic energy

Heat is an example of: 

• solar energy
• mechanical energy
• thermal energy
• nuclear energy

Which simple machine would be the most efficient for lifting an object 30m off the ground? 

• pulley
• screw
• wedge
• lever

What is the basic unit of life? 

• organelle
• nucleus
• membrane
• cell

Which characteristic do the volvox and the eulgena share? 

• both have pseudopods
• both use flagella to move
• both use eyespots to move

Which is a function of the respiratory system? 

• to provide the body with carbon dioxide, which reacts with food to produce energy
• to provide the body with oxygen, which react with food to produce energy
• to provide the cells with glucose, which is used as a source of energy

When your body fights a disease, it uses _________ to mark the pathogen.

• antibodies
• hormones
• melanin

Which best explains why sexual reproduction produces greater variation in offspring? 

• DNA comes from two genetically different parents
• DNA comes from one parent that is genetically identical
• sex cells are produced by mitosis