Photosynthesis, Respiration, and Ecology

How could you tell whether the material is an element or a compound?

• compounds contain only one type of atom

• elements contain only one type of atom

• compounds cannot be further broken down

• elements can be further broken down

Which claim explains why all organisms need food?

• it provides all water needed

• it provides all energy needed

• it provides all oxygen that is needed for respiration

• it provides all DNA needed to grow.

What is matter?

• something that has mass and takes up space

• something that causes change

• something that conducts electricity

• something that cannot be seen

What is energy?

• something that has mass and takes up space

• something that causes change

• something that conducts electricity

• something that cannot be seen

What does the law of conservation of energy state?

• It is important to use as little energy as possible.

• Organisms save the energy that they create.

• Organisms change energy into mass.

• Energy cannot be created or destroyed.

During cellular respiration, cells break down food to release energy. During photosynthesis, cells produce food in the form of glucose. What is one difference between these two processes?

• Cellular respiration uses oxygen and photosynthesis produces oxygen.

• Cellular respiration uses carbon dioxide and photosynthesis does not.

• Cellular respiration produces oxygen and photosynthesis does not.

• Photosynthesis produces twice as much glucose than cellular respiration does.

In the carbon cycle, how do living things store most of their energy?

• water

• organic molecules

• light energy

• heat energy

What do plants do with the oxygen produced in their cells during photosynthesis?

• reuse it during photosynthesis

• combine it with water to make sugar

• exhale it

• store it for later use

True or False: Plants can use BOTH photosynthesis and cellular respiration.

• TRUE

• FALSE

Answer explanation

They use photosynthesis when light energy is present (the sun) and cellular respiration when there is no light present.

Where is the ultimate energy source for living things here on Earth?

• the ocean

• the soil

• the sun

• the wind