Ecosystems 1

A closed system is a group of objects that transfer energy only to each other. What is true of any closed system?

• Each object in a closed system will have a higher energy level than its original level.

• The law of conservation always applies.

• Kinetic energy is always transformed into potential energy.

• The system may have more energy that was put in to it.

Tags

NGSS.MS-PS3-5

A scientist wants to know why the honeybee population is declining. Which step will he perform first?

• Observe the problem and make a hypothesis.

• Conduct an experiment.

• Research to see if there is already an accepted explanation.

• Communicate the question to as many scientists as possible.

A mouse is more active when another mouse is added to the cage. What is the dependent variable?

• Whether another mouse is added

• the size of the cage

• the number of times the mouse moves

• the temperature of the cage

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

Dr. Jasper is conducting a study on feeding habits of deer. Why did she choose a field study?

• because she wanted to observe the deer in their natural habitat

• because she wanted to manipulate the variables

• because she wanted to observe a simplified version of the environment

• because she wanted to simulate the life cycle of deer

In an energy pyramid what happens to most of the energy that is not passed on to the next level?

• It is converted to matter and released as waste

• It is converted to heat and released to the environment

• It is converted to food that is eaten by the organism

• Is is used up by the organism at the earlier level

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

How does a food chain illustrate the law of conservation of energy?

• It shows how energy is destroyed

• It shows how sunlight is converted to food

• It shows how sunlight is converted into matter

• It shows how energy stored in food moves from one organism to the next

What do the arrows in food chains represent?

• Energy being transferred between organisms

• plants and animals that require the same resource

• matter being transferred between organisms

• they share a common ancestor

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-3

What step is last in a scientific experiment?

• Communicating the results

• Writing the hypothesis

• Analyzing the results

• Changing variables

What can not happen to energy according to the law of conservation of energy?

• Energy cannot be transformed

• Energy can not be changed

• Energy cannot be created

• Energy cannot be converted

Tags

NGSS.MS-PS3-4

Living systems follow the law of conservation of mass. Which of the following statements does not summarize a key idea of this law?

• Matter is not destroyed during a chemical reaction

• Matter can be created during a chemical reaction

• Matter cannot be created during a chemical reaction

• Matter can change form during a chemical reaction

Tags

NGSS.MS-PS1-5