Homework Practice

Printable assignment

Respiration in Organisms: Core Ideas

Start with Concepts

Question 1mcq

Which statement best distinguishes breathing from cellular respiration?

A.Breathing moves air in and out; cellular respiration releases energy from food in cells.

B.Breathing happens only in plants.

C.Cellular respiration means chewing food.

D.Breathing and respiration are exactly the same process.

Question 2mcq

Why is oxygen taken into the body during breathing?

A.It turns lungs into food.

B.It is used by cells to release energy from food.

C.It is stored only in bones forever.

D.It makes blood disappear.

Question 3mcq

A student says, “Respiration happens only in the lungs.” What is the best correction?

A.Respiration happens only in the mouth.

B.Cells do not need energy.

C.Breathing involves lungs, but cellular respiration happens in body cells.

D.Lungs are not involved in breathing.

Question 4mcq

Which activity is evidence of breathing, not directly cellular respiration?

A.Glucose breaks down inside cells.

B.Energy is released in cells.

C.Carbon dioxide is produced by cell reactions.

D.Chest moves up and down while air enters and leaves.

Question 5mcq

Why do all living cells need respiration?

A.They need energy for life processes.

B.They need to make soil.

C.They need to stop all movement of gases.

D.They need to become non-living.

Use the Ideas

Question 6mcq

Assertion: Breathing supports cellular respiration. Reason: Breathing supplies oxygen and removes carbon dioxide. Which option is correct?

A.Both are true, but the reason does not explain the assertion.

B.Both assertion and reason are true, and the reason explains the assertion.

C.The assertion is false, but the reason is true.

D.Both assertion and reason are false.

Question 7mcq

Which word equation best represents aerobic respiration?

A.Carbon dioxide + water

ightarrow

oxygen + glucose only

B.Oxygen + salt

ightarrow

soil + heat

C.Glucose + oxygen

ightarrow

carbon dioxide + water + energy

D.Glucose

ightarrow

alcohol + carbon dioxide only

Question 8mcq

Why is aerobic respiration generally more efficient than anaerobic respiration?

A.It releases no energy.

B.It happens only outside cells.

C.It produces soil instead of energy.

D.It releases more energy from the same food because oxygen is used.

Question 9mcq

In an experiment, lime water turns milky when a person exhales into it. What does this show?

A.Exhaled air contains carbon dioxide.

B.Exhaled air contains no gases.

C.Oxygen turns lime water milky.

D.Lime water detects soil particles only.

Question 10mcq

Which pair is consumed and produced during aerobic respiration?

A.Consumes carbon dioxide; produces soil

B.Consumes oxygen; produces carbon dioxide

C.Consumes nitrogen; produces glucose only

D.Consumes sunlight; produces chlorophyll