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Primary 5 Science Systems Quiz
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Questions
Primary 5 Science Quiz - Systems
Name: ____________________
Class: ____________________
Date: ____________________
Score: _____ / 40
Duration: 40 minutes
Total Marks: 40
Instructions
- Answer all questions.
- Write your answers in the spaces provided.
- Marks for each question are shown in brackets [ ].
- You are advised to spend no more than 40 minutes on this paper.
- The use of calculators is not permitted.
Section A: Multiple Choice (Questions 1–10)
Each question carries 2 marks. Choose the most correct answer and write its letter in the space provided.
1. Which of the following best describes a "system"?
(A) A single organ that carries out one function
(B) A group of parts that work together to perform a function
(C) A collection of unrelated objects in the body
(D) A group of organisms living together
Answer: ____________ [2]
2. In the human digestive system, where does the absorption of digested food mainly take place?
(A) Stomach
(B) Large intestine
(C) Small intestine
(D) Mouth
Answer: ____________ [2]
3. Which part of the plant transport system carries water and mineral salts from the roots to the leaves?
(A) Phloem
(B) Stomata
(C) Xylem
(D) Epidermis
Answer: ____________ [2]
4. The diagram below shows a simple electrical circuit.
[Battery] ——— [Wire] ——— [Bulb] ——— [Wire] ——— [Battery]
What will happen if the wire connecting the bulb to the battery is cut?
(A) The bulb will glow brighter.
(B) The bulb will continue to glow.
(C) The bulb will not light up.
(D) The battery will overheat.
Answer: ____________ [2]
5. Which of the following is the correct path of blood flow in the human circulatory system?
(A) Heart → Lungs → Body → Heart
(B) Heart → Body → Lungs → Heart
(C) Lungs → Heart → Body → Lungs
(D) Body → Lungs → Heart → Body
Answer: ____________ [2]
6. In a flowering plant, the female reproductive part is the:
(A) Stamen
(B) Petal
(C) Pistil (carpel)
(D) Sepal
Answer: ____________ [2]
7. Which component of an electrical system is responsible for providing electrical energy?
(A) Switch
(B) Bulb
(C) Wire
(D) Battery
Answer: ____________ [2]
8. The human respiratory system is responsible for:
(A) Transporting food to all parts of the body
(B) Taking in oxygen and removing carbon dioxide
(C) Pumping blood throughout the body
(D) Breaking down food into simpler substances
Answer: ____________ [2]
9. Which of the following shows a complete circuit?
(A) A battery connected to a bulb with one wire only
(B) A battery connected to a bulb with two wires forming a closed loop
(C) A battery connected to two bulbs with no return wire
(D) A single wire connected to a bulb with no battery
Answer: ____________ [2]
10. In the plant transport system, the phloem mainly transports:
(A) Water
(B) Mineral salts
(C) Food (sugars)
(D) Carbon dioxide
Answer: ____________ [2]
Section B: Short Answer (Questions 11–16)
Answer each question in the space provided. Marks are shown in brackets.
11. State two organs that are part of the human digestive system and describe the function of each.
(a) Organ 1: ___________________________
Function: ____________________________________________________________ [2]
(b) Organ 2: ___________________________
Function: ____________________________________________________________ [2]
12. The diagram below shows a simple electrical circuit with a battery, a switch, and a light bulb.
[Battery (+)] ——— [Switch (open)] ——— [Bulb] ——— [Battery (-)]
(a) Is the circuit complete or incomplete? Explain your answer.
________________________________________________________________________ [1]
(b) What will happen to the bulb when the switch is closed? Give a reason.
________________________________________________________________________ [1]
13. Complete the table below to show the function of each part of the plant transport system.
| Part of Plant Transport System | Function |
|---|---|
| Xylem | ________________________________________ [1] |
| Phloem | ________________________________________ [1] |
14. Explain why the human circulatory system is described as a "double circulation" system.
________________________________________________________________________ [2]
15. A student set up two electrical circuits:
- Circuit X: Two bulbs connected in series with one battery.
- Circuit Y: Two bulbs connected in parallel with one battery.
If one bulb is removed from each circuit, what will happen to the remaining bulb in each circuit? Explain your answer.
Circuit X: _______________________________________________________________
________________________________________________________________________ [1]
Circuit Y: _______________________________________________________________
________________________________________________________________________ [1]
16. State two differences between the human respiratory system and the plant transport system.
| Human Respiratory System | Plant Transport System | |
|---|---|---|
| Difference 1 | _________________________ | _________________________ [1] |
| Difference 2 | _________________________ | _________________________ [1] |
Section C: Structured / Application Questions (Questions 17–20)
Answer all questions. Marks are shown in brackets. Show your working or reasoning clearly.
17. The diagram shows the human digestive system.
[Mouth] → [Oesophagus] → [Stomach] → [Small Intestine] → [Large Intestine] → [Anus]
(a) Name the organ where most digestion and absorption of food takes place. [1]
(b) Explain why the small intestine is well suited for absorption of digested food. Give two reasons. [2]
Reason 1: _______________________________________________________________
Reason 2: _______________________________________________________________
(c) What would happen if the stomach stopped producing digestive juices? Explain the effect on the digestive system. [2]
18. Study the diagram of a flowering plant below.
[Petals]
|
[Stamen] [Pistil]
|
[Sepals]
|
[Stem]
|
[Roots]
(a) Name the male reproductive part and the female reproductive part of the flower. [2]
Male: ___________________________
Female: ___________________________
(b) Describe the process of pollination. [2]
(c) After fertilisation, what does the ovary develop into? [1]
19. A student connected three bulbs (A, B, and C) in a series circuit with a battery and a switch.
(a) Draw a circuit diagram showing three bulbs connected in series with a battery and a switch. Use the correct symbols. [2]
[Space for diagram]
(b) If bulb B fuses (burns out), what will happen to bulbs A and C? Explain your answer. [2]
(c) The student now reconnects the three bulbs in parallel. If bulb B fuses, what will happen to bulbs A and C? Explain your answer. [2]
20. The table below shows the functions of four body systems in the human body.
| System | Function |
|---|---|
| A | Transports oxygen, food, and waste products around the body |
| B | Takes in oxygen and removes carbon dioxide from the body |
| C | Breaks down food into simpler substances that can be absorbed |
| D | Carries water and mineral salts from roots to leaves |
(a) Identify each system (A, B, C, D). [4]
A: _________________________________
B: _________________________________
C: _________________________________
D: _________________________________
(b) Explain how systems A and B work together to keep the body alive. [2]
(c) System D is found in plants, not humans. Name the plant system that is most similar in function to system A in humans. Give a reason for your answer. [2]
End of Quiz
Check your answers carefully before submitting.
Answers
Primary 5 Science Quiz - Systems
Answer Key
Section A: Multiple Choice (Questions 1–10)
1. (B) A group of parts that work together to perform a function [2]
Explanation: A system is defined as a group of organs or parts that work together to carry out a specific function. A single organ alone does not make a system.
2. (C) Small intestine [2]
Explanation: The small intestine is the main site of absorption. Its inner walls are lined with villi, which increase the surface area for absorption of digested food into the bloodstream.
3. (C) Xylem [2]
Explanation: Xylem vessels transport water and mineral salts from the roots up to the leaves. Phloem transports food (sugars).
4. (C) The bulb will not light up. [2]
Explanation: Cutting the wire breaks the circuit, so electric current can no longer flow through the bulb. The circuit is incomplete.
5. (A) Heart → Lungs → Body → Heart [2]
Explanation: Blood flows from the heart to the lungs (to pick up oxygen), then back to the heart, then to the body (to deliver oxygen), and finally back to the heart. This is double circulation.
6. (C) Pistil (carpel) [2]
Explanation: The pistil (or carpel) is the female reproductive part of a flower, consisting of the stigma, style, and ovary. The stamen is the male part.
7. (D) Battery [2]
Explanation: The battery provides electrical energy to the circuit. Wires conduct the current, the switch controls the flow, and the bulb converts electrical energy to light.
8. (B) Taking in oxygen and removing carbon dioxide [2]
Explanation: The respiratory system is responsible for gaseous exchange — taking in oxygen and removing carbon dioxide from the body.
9. (B) A battery connected to a bulb with two wires forming a closed loop [2]
Explanation: A complete circuit requires a closed loop so that electric current can flow from the battery, through the bulb, and back to the battery.
10. (C) Food (sugars) [2]
Explanation: The phloem transports food (mainly sugars produced during photosynthesis) from the leaves to other parts of the plant.
Section B: Short Answer (Questions 11–16)
11. [4 marks — 2 marks per organ with function]
Accept any two of the following (or other valid organs):
(a) Example answer:
Organ 1: Stomach
Function: The stomach churns food and mixes it with digestive juices (containing enzymes and acid) to break down proteins.
(b) Example answer:
Organ 2: Small intestine
Function: The small intestine completes digestion and absorbs digested food into the bloodstream through the villi.
Marking notes:
- Award 1 mark for correctly naming a valid digestive organ.
- Award 1 mark for a correct, relevant function.
- Accept: Mouth (chewing, starch digestion), Oesophagus (transports food), Large intestine (absorbs water), Liver (produces bile).
12. [2 marks]
(a) The circuit is incomplete because the switch is open, so there is a gap in the circuit and electric current cannot flow. [1]
(b) The bulb will light up because closing the switch completes the circuit, allowing electric current to flow through the bulb. [1]
Marking notes:
- Award 1 mark for identifying the circuit as incomplete with a valid reason.
- Award 1 mark for stating the bulb will light up with a valid reason.
13. [2 marks]
| Part of Plant Transport System | Function |
|---|---|
| Xylem | Transports water and mineral salts from the roots to the leaves [1] |
| Phloem | Transports food (sugars) from the leaves to other parts of the plant [1] |
Marking notes:
- Award 1 mark for each correct function.
- Do not accept vague answers like "carries things" — the specific substance must be named.
14. [2 marks]
The human circulatory system is called a "double circulation" system because blood passes through the heart twice in one complete circuit around the body. First, blood is pumped from the heart to the lungs (pulmonary circulation) to pick up oxygen and release carbon dioxide. Then the oxygen-rich blood returns to the heart and is pumped to the rest of the body (systemic circulation) to deliver oxygen and nutrients.
Marking notes:
- Award 2 marks for a clear explanation mentioning blood passes through the heart twice and naming both pulmonary and systemic circulation.
- Award 1 mark for mentioning blood passes through the heart twice without further detail.
- Award 1 mark for correctly describing one type of circulation.
15. [2 marks]
Circuit X (series): The remaining bulb will not light up because in a series circuit, there is only one path for current. Removing one bulb breaks the circuit, so no current flows. [1]
Circuit Y (parallel): The remaining bulb will continue to glow because in a parallel circuit, each bulb has its own separate path for current. Removing one bulb does not affect the other path. [1]
Marking notes:
- Award 1 mark for each correct outcome with a valid explanation.
- Award 1 mark for correct outcome only (no explanation) per circuit.
16. [2 marks]
Accept any two valid differences. Example answer:
| Human Respiratory System | Plant Transport System | |
|---|---|---|
| Difference 1 | Takes in oxygen and removes carbon dioxide | Transports water, minerals, and food throughout the plant [1] |
| Difference 2 | Involves organs such as the lungs and trachea | Involves tissues such as xylem and phloem [1] |
Other acceptable differences:
- Respiratory system is for gaseous exchange; plant transport system is for transporting substances.
- Respiratory system works with the circulatory system; plant transport system works independently.
- Respiratory system involves breathing; plant transport system does not involve breathing.
Marking notes:
- Award 1 mark per valid, clearly stated difference.
- Both differences must compare the two systems directly.
Section C: Structured / Application Questions (Questions 17–20)
17. [5 marks]
(a) Small intestine [1]
(b) Two reasons why the small intestine is well suited for absorption: [2]
Reason 1: The small intestine is very long, providing a large surface area for absorption of digested food.
Reason 2: The inner walls of the small intestine are lined with villi (tiny finger-like projections), which increase the surface area further and contain blood vessels close to the surface for efficient absorption.
Other acceptable reasons:
- The walls of the small intestine are thin (one cell thick), allowing substances to pass through easily.
- The villi have a rich supply of blood vessels to carry away absorbed food quickly.
Marking notes:
- Award 1 mark per valid reason (maximum 2 marks).
- Award 1 mark for mentioning "large surface area" even if the specific reason (length or villi) is not stated.
(c) If the stomach stopped producing digestive juices: [2]
The food would not be properly broken down in the stomach. Proteins would not be digested effectively, and the food entering the small intestine would be less broken down. This would make it harder for the small intestine to complete digestion and absorb nutrients, leading to poor nutrition. The stomach acid also kills bacteria, so without it, harmful bacteria might enter the intestines.
Marking notes:
- Award 2 marks for a clear explanation covering the effect on digestion and a consequence.
- Award 1 mark for stating that food would not be broken down properly without further explanation.
- Award 1 mark for mentioning a valid consequence (e.g., poor nutrition, bacteria not killed).
18. [5 marks]
(a) Male: Stamen [1]
Female: Pistil (Carpel) [1]
(b) Pollination is the process where pollen grains are transferred from the anther (part of the stamen) to the stigma (part of the pistil) of a flower. This can be done by wind, insects, or other agents. [2]
Marking notes:
- Award 1 mark for mentioning pollen grains moving from anther to stigma.
- Award 1 mark for mentioning the agent of pollination (wind/insects) or for a clear, complete description.
(c) The ovary develops into a fruit [1].
Marking notes:
- Accept "fruit" only. Do not accept "seed" — the ovule develops into the seed, while the ovary becomes the fruit.
19. [6 marks]
(a) Circuit diagram — three bulbs in series with a battery and switch: [2]
(+) —— [Battery] —— [Switch] —— [Bulb A] —— [Bulb B] —— [Bulb C] —— (-)
Accept any correct series circuit diagram using standard symbols.
Marking notes:
- Award 2 marks for a correct series circuit with all components (battery, switch, 3 bulbs) in a single loop.
- Award 1 mark for a series circuit with minor errors (e.g., missing switch symbol, incorrect bulb symbol).
- Award 0 marks if the circuit is drawn as parallel.
(b) If bulb B fuses in a series circuit: [2]
Bulbs A and C will not light up. In a series circuit, there is only one path for electric current. When bulb B fuses, the circuit is broken (incomplete), so no current can flow through any of the bulbs.
Marking notes:
- Award 1 mark for stating bulbs A and C will not light up.
- Award 1 mark for explaining that the circuit is broken / there is only one path for current.
(c) If bulb B fuses in a parallel circuit: [2]
Bulbs A and C will continue to glow. In a parallel circuit, each bulb has its own separate path for current. When bulb B fuses, only the path through bulb B is broken. The paths through bulbs A and C remain complete, so current continues to flow through them.
Marking notes:
- Award 1 mark for stating bulbs A and C will continue to glow.
- Award 1 mark for explaining that each bulb has its own path / the other paths remain complete.
20. [8 marks]
(a) Identify each system: [4]
A: Circulatory system [1]
B: Respiratory system [1]
C: Digestive system [1]
D: Plant transport system [1]
Marking notes:
- Award 1 mark for each correct identification.
- Accept "blood system" for A, "breathing system" for B, and "food system" for C (informal but acceptable at P5).
(b) How systems A and B work together: [2]
The respiratory system takes in oxygen from the air. The oxygen passes from the lungs into the blood. The circulatory system (heart and blood vessels) then transports the oxygen-rich blood to all parts of the body. At the same time, the circulatory system carries carbon dioxide (a waste product) from the body back to the lungs, where the respiratory system removes it from the body during exhalation.
Marking notes:
- Award 2 marks for a clear explanation showing the link between the two systems (oxygen from lungs → blood → body, and carbon dioxide from body → lungs).
- Award 1 mark for mentioning one direction of the relationship (e.g., oxygen from lungs to blood).
- Award 1 mark for mentioning both systems but without clear linkage.
(c) Plant system most similar to the human circulatory system: [2]
The plant transport system (specifically the xylem and phloem) is most similar to the human circulatory system. Just as the circulatory system transports oxygen, food, and waste products around the human body through blood vessels, the plant transport system transports water, mineral salts, and food around the plant through the xylem and phloem.
Marking notes:
- Award 1 mark for correctly naming the plant transport system (or xylem/phloem).
- Award 1 mark for a valid comparison explaining that both systems transport substances around the organism.
- Accept answers that mention "vascular system" or "xylem and phloem" specifically.
Mark Summary
| Section | Questions | Marks |
|---|---|---|
| A: Multiple Choice | 1–10 | 20 |
| B: Short Answer | 11–16 | 14 |
| C: Structured / Application | 17–20 | 22 |
| Total | 20 questions | 40 |
Note: The total marks across all sections sum to 40 marks.
Common Mistakes to Watch For
- Q3 / Q10: Students often confuse xylem and phloem. Remember: Xylem carries water (both have the letter 'e' in the middle); Phloem carries food/produce.
- Q14: Students may describe single circulation (fish) instead of double circulation. Emphasise that blood passes through the heart twice per complete circuit.
- Q15 / Q19: Students frequently mix up series and parallel circuit behaviour. In series, one break stops everything; in parallel, each branch is independent.
- Q18(c): Students may say the ovary becomes a "seed" — correct this: the ovary becomes the fruit, and the ovule becomes the seed.
- Q20: Students may not clearly link the respiratory and circulatory systems. Encourage them to trace the path of oxygen from air → lungs → blood → body.