Unit 3 Test

What is the term for an organism that makes its own source of chemical energy?

• A. chloroplast

• B. decomposer

• C. producer

• D. protist

Which of these is a reactant(input) in photosynthesis?

• A. 0₂

• B. CO₂

• C. COOH

• D. C6H12O6

Which organisms produce the energy for other consumers in an ecosystem? The basis for the energy in an ecosystem is provided by

• A. chemosynthesis

• B. consumers

• C. heterotrophs

• D. producers

Which phrase describes the function of mitochondria?

• A. packages proteins

• B. breaks down chemicals

• C. supplies energy to the cell

• D. fluid-filled sac used for storage

What do all the biotic(Living) and abiotic(non living) factors in a given area make up?

• A. a habitat

• B. a population

• C. a community

• D. an ecosystem

Through photosynthesis, plants convert energy from sunlight into

• A. light energy

• B. thermal energy

• C. chemical energy

• D. mechanical energy

What do chloroplasts and mitochondria have in common?

• A. production of ATP

• B. presence in all cells

• C. digestion of cell wastes

• D. absorption of light energy

Food webs are models that show

• A. stored energy in food chains

• B. networks of feeding relationships

• C. only primary consumers in an ecosystem

• D. one sequence of producers and consumers

Which of these statements best describes cellular respiration?

• A. Sunlight and carbon dioxide are used to make ATP.

• B. ATP and oxygen are used to make sugars and starches.

• C. ATP and carbon dioxide are used to make ADP and water.

• D. Carbon-based molecules (like sugar/glucose) from food and oxygen are used to make ATP.

At each trophic level, the energy stored in the organisms in that level is about

• A. 10% of the energy in the level above it

• B. 10% of the energy in the level below it

• C. 50% of the energy in the level below it

• D. 100% of the energy in the level below it