Homework Practice

Printable assignment

Final Assessment: Respiration in Organisms

Section A: Core Concepts

Question 1mcq

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 2mcq

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.

Question 3mcq

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 4mcq

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

Question 5mcq

A sealed jar with germinating seeds is connected to lime water. The lime water turns milky. What is the best inference?

A.The seeds are not alive.

B.The seeds are producing sand.

C.The seeds are respiring and releasing carbon dioxide.

D.Lime water turns milky only due to oxygen.

Question 6mcq

A student thinks only animals respire aerobically. Which example proves the idea incomplete?

A.A stone becomes warm in sunlight.

B.Plastic melts near heat.

C.A dry leaf is brown.

D.Germinating seeds use oxygen and release carbon dioxide.

Section B: Observations and Data

Question 7mcq

Yeast makes dough rise mainly because it produces which gas during anaerobic respiration?

A.Oxygen

B.Nitrogen only

C.Carbon dioxide

D.Chlorine

Question 8mcq

Which product is commonly formed in yeast during anaerobic respiration along with carbon dioxide?

A.Starch only

B.Oxygen only

C.Clay

D.Alcohol

Question 9mcq

A student says anaerobic respiration releases no energy because oxygen is absent. What is correct?

A.It releases less energy than aerobic respiration, but still releases some energy.

B.It always releases more energy than aerobic respiration.

C.It happens only in rocks.

D.It changes carbon dioxide into sunlight.

Question 10mcq

Why are alveoli useful in the lungs?

A.They provide a large surface for gas exchange.

B.They grind food into smaller pieces.

C.They carry urine to the bladder.

D.They produce humus in soil.

Question 11mcq

A student labels the food pipe as the main air passage to the lungs. What should be corrected?

A.The food pipe carries air to every cell.

B.The trachea is the main air passage, not the food pipe.

C.The trachea carries food to the stomach.

D.Lungs are part of the digestive system.

Question 12mcq

Which observation best shows exhaled air has more carbon dioxide than inhaled air?

A.A candle becomes taller in exhaled air.

B.Exhaled air always has no moisture.

C.Lime water turns milky faster when exhaled air is passed through it.

D.Inhaled air turns into soil in the lungs.

Section C: Applications

Question 13mcq

If breathing rate changes from

18

30

breaths per minute after exercise, what is the increase?

12

breaths per minute

48

breaths per minute

30

breaths per minute

18

breaths per minute

Question 14mcq

Why should a breathing-rate experiment be repeated for several students or trials?

A.To avoid measuring any data.

B.To make the conclusion more reliable.

C.To make oxygen disappear.

D.To prove all students must have identical rates.

Question 15mcq

A student concludes that exercise reduces breathing rate after measuring only one breath immediately after running. What is the main problem?

A.Breathing rate cannot be counted.

B.Running has no effect on energy need.

C.The measurement is too limited and may not represent the true breathing rate.

D.Only soil experiments need repeated readings.

Question 16mcq

A fish taken out of water struggles to survive. Which reason is most accurate?

A.It forgets how to breathe.

B.It needs soil to breathe.

C.Its gills are adapted to extract oxygen from water, not air.

D.Its lungs become too large.

Question 17mcq

A frog can exchange gases through skin as well as lungs. What advantage does moist skin provide?

A.It stops all oxygen entry.

B.It makes the frog photosynthesise.

C.It changes lungs into gills.

D.It allows gases to dissolve and diffuse.

Question 18mcq

Which pairing is correct for animal respiration?

A.Cockroach: lungs; fish: skin only

B.Earthworm: gills; human: spiracles

C.Fish: trachea; frog: no gas exchange

D.Cockroach: spiracles; fish: gills

Section D: Reasoning Challenge

Question 19mcq

A potted plant is overwatered for many days and roots begin to rot. Which explanation is most likely?

A.Too much water creates unlimited oxygen in soil.

B.Roots need no oxygen.

C.Waterlogging reduces air spaces, so roots get less oxygen for respiration.

D.Waterlogging increases stomata in roots.

Question 20mcq

A student says plants only photosynthesise and never respire. What is correct?

A.Plants respire only after death.

B.Photosynthesis and respiration are the same word.

C.Only flowers respire, not roots.

D.Plants photosynthesise in light but their living cells also respire.

Question 21mcq

Which plant part is most directly involved in gas exchange from leaves?

A.Stomata on leaf surfaces

B.Kidneys

C.Heart valves

D.Fish gills

Question 22mcq

Lime water near germinating seeds turns milky. Which gas caused the change?

A.Oxygen

B.Hydrogen

C.Nitrogen

D.Carbon dioxide

Question 23mcq

A runner pants after a sprint. Which explanation links breathing and respiration best?

A.More breathing supplies oxygen for increased cellular respiration in muscles.

B.Panting stops all respiration.

C.Panting proves oxygen is not needed.

D.Muscles release energy without food always.

Question 24mcq

Assertion: A sealed container with living seeds may show carbon dioxide build-up. Reason: Germinating seeds respire. Which option is correct?

A.Both are true, but unrelated.

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

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

D.Both are false.