CIE iGCSE Co-Ordinated Science B12. Respiration Exam Style Questions Paper 1
Question
What is respiration?
A. breakdown of food by enzymes in the alimentary canal
B. breathing to supply oxygen to cells
C. release of carbon dioxide from the lungs
D. release of energy for body activities
▶️Answer/Explanation
Answer: D
Explanation: Respiration is the process by which cells break down glucose to release energy for body activities. This process occurs in the mitochondria of cells and involves the production of ATP (adenosine triphosphate), which is used as energy by the body.
Question
A person ran up as many stairs as they could in one minute.
What would be the effect on their breathing?
A. depth of breathing decreased, rate of breathing decreased
B. depth of breathing decreased, rate of breathing increased
C. depth of breathing increased, rate of breathing decreased
D. depth of breathing increased, rate of breathing increased
▶️Answer/Explanation
Answer: D. depth of breathing increased, rate of breathing increased
Explanation: During vigorous exercise, such as running up stairs, the body requires more oxygen to meet the increased energy demand. This leads to an increase in both the depth (volume) and rate (frequency) of breathing to supply more oxygen to the muscles and remove carbon dioxide.
Question
What is the word equation for aerobic respiration?
A. carbon dioxide + water → glucose + oxygen
B. carbon dioxide + oxygen → glucose + water
C. glucose + oxygen → carbon dioxide + water
D. glucose + water → carbon dioxide + oxygen
▶️Answer/Explanation
Answer: C. glucose + oxygen → carbon dioxide + water
Explanation: Aerobic respiration is the process by which glucose is broken down in the presence of oxygen to produce carbon dioxide, water, and energy.
Question
What are the products of aerobic respiration?
1 carbon dioxide
2 glucose
3 water
A 1 and 2 only B 1 and 3 only C 1, 2 and 3 D 2 and 3 only
▶️Answer/Explanation
Ans : B
Question
A student places an insect in a sealed test-tube and measures the concentration of oxygen and
carbon dioxide in the test-tube. The insect is left for 30 minutes.
The concentration of oxygen and carbon dioxide are then measured again. The results are shown in the table.
Which row shows how these concentrations change during the experiment?
▶️Answer/Explanation
Ans: B
Question
Which diagram of a cell shows the correct movement of substances for the process of aerobic respiration?
▶️Answer/Explanation
Ans: C
Question
Which characteristic of living organisms involves chemical reactions that break down nutrient molecules to release energy?
(A) excretion
(B) nutrition
(C) reproduction
(D) respiration
▶️Answer/Explanation
Ans: D
Question
The diagram shows apparatus used to investigate respiration of blowfly larvae.
Air is sucked through the solutions of hydrogencarbonate indicator as shown.
Hydrogencarbonate indicator turns orange with carbon dioxide at atmospheric concentration. It
turns yellow with high carbon dioxide concentration.
What are the colours of the hydrogencarbonate indicator in the flasks after 24 hours?
▶️Answer/Explanation
Ans : B
Question
Which process provides the energy for the maintenance of a constant body temperature?
A homeostasis
B photosynthesis
C respiration
D sweating
▶️Answer/Explanation
Ans : C
Question
During cold weather, warm blooded animals, such as mammals and birds, require more food.
Which statement explains the reason for this?
▶️Answer/Explanation
Ans : A
Question
Small mammals need more energy to maintain a constant body temperature.
The graph shows the rate of oxygen used by species of shrews with different body masses.
Which statements are correct?
1 Heavier shrews use oxygen more slowly than lighter shrews.
2 Heavier shrews respire faster than lighter shrews.
3 Heavier shrews lose heat more slowly than lighter shrews.
(A) 1, 2 and 3
(B) 1 and 2 only
(C) 1 and 3 only
(D) 2 and 3 only
▶️Answer/Explanation
Ans: C
Question
The apparatus shown is set up and left for 10 minutes. The insects are able to move around in
the test-tube but the wire mesh prevents them from falling into the sodium hydroxide.
In which direction does the oil droplet move and why?
▶️Answer/Explanation
Ans : B
Question
Which process uses energy?
A. cell division
B. diffusion
C. osmosis
D. respiration
▶️Answer/Explanation
Answer: A. cell division
Explanation: Cell division is an active process that requires energy, typically provided by ATP. Diffusion and osmosis are passive processes that do not require energy. Respiration is the process that releases energy from glucose, but it does not use energy itself.
Question
What is the equation for aerobic respiration?
A) carbon dioxide + water → oxygen + glucose
B) glucose + carbon dioxide → oxygen + water
C) oxygen + glucose → carbon dioxide + water
D) oxygen + water → glucose + carbon dioxide
▶️Answer/Explanation
Answer: C) oxygen + glucose → carbon dioxide + water
Explanation: Aerobic respiration is the process by which cells use oxygen to break down glucose and produce carbon dioxide, water, and energy. The balanced equation is: \[ \text{C}_6\text{H}_{12}\text{O}_6 + 6\text{O}_2 \rightarrow 6\text{CO}_2 + 6\text{H}_2\text{O} \]
Question
Some students investigated aerobic respiration in woodlice. They set up the apparatus as shown.
After 1 hour they recorded the appearance of the limewater in X and Y.
Which row is correct for the appearance of X and Y?
| X | Y | |
|---|---|---|
| A | milky | milky |
| B | milky | clear |
| C | clear | milky |
| D | clear | clear |
▶️Answer/Explanation
Answer: C. clear, milky
Explanation: In aerobic respiration, carbon dioxide is produced, which turns limewater milky. Therefore, the limewater in Y (after the woodlice) will turn milky, while the limewater in X (before the woodlice) will remain clear.
Question
Which processes use energy released by respiration?
A. 1, 2 and 3
B. 1, 3 and 4
C. 1, 4 and 5
D. 4 and 5 only
▶️Answer/Explanation
Answer: C. 1, 4 and 5
Explanation: Respiration releases energy that is used for various cellular processes, including cell division (1), muscle contraction (4), and protein synthesis (5).
Question
An experiment using germinating seeds is set up as shown, and left at room temperature for 12 hours.
The pump is then switched on and air is drawn through the apparatus for 2 minutes.
Which row identifies solutions P and Q and the results obtained?
| solution P | solution P results | solution Q | solution Q results | |
|---|---|---|---|---|
| A | ethanol | remains colourless | ethanol | turns milky |
| B | ethanol | turns milky | limewater | remains colourless |
| C | limewater | remains colourless | limewater | turns milky |
| D | limewater | turns milky | ethanol | remains colourless |
▶️Answer/Explanation
Answer: C. limewater remains colourless, limewater turns milky
Explanation: Limewater turns milky in the presence of carbon dioxide, indicating that the germinating seeds are respiring and producing CO₂. Ethanol would not react with CO₂, so it remains colorless.
Question
Which area represents the substances produced in aerobic respiration?
▶️Answer/Explanation
Answer: C. both carbon dioxide and water
Explanation: Aerobic respiration produces carbon dioxide and water as waste products. The overall equation for aerobic respiration is glucose + oxygen → carbon dioxide + water + energy.
Question
Which substances are used and produced in aerobic respiration?
▶️Answer/Explanation
Answer: B
Explanation: In aerobic respiration, glucose and oxygen are used to produce energy, carbon dioxide, and water. This process occurs in the mitochondria of cells.