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Primary 4 Science Living Together Quiz

Free P4 Science Living Together quiz, Exam version, with questions, answers, and syllabus-aligned practice for Singapore students.

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Primary 4 Science From Real Exams Generated by DeepSeek V4 Flash Sample 03 Updated 2026-08-17

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Questions

Primary 4 Science Quiz - Living Together

Name: _____________________________ Class: _____________________________ Date: _____________________________ Score: _______________ / 40

Duration: 40 minutes Total Marks: 40

Instructions:

Answer all questions in the spaces provided.
Show your working or reasoning where required.
For multiple-choice questions, write the letter of the correct answer in the box.
This quiz covers the topic Living Together, focusing on how organisms interact with each other and their environment.

Section A: Multiple-Choice Questions (5 questions, 10 marks)

Circle the letter of the correct answer. Each question is worth 2 marks.

1. A plant needs sunlight to make its own food. What is the name of the process by which a plant makes food using sunlight? A) Respiration B) Photosynthesis C) Germination D) Digestion

_______ (2 marks)

2. Which of the following shows a predator-prey relationship? A) A bee collecting nectar from a flower. B) A deer eating grass in a field. C) A lion hunting and eating a zebra. D) A bird building a nest in a tree.

_______ (2 marks)

3. The picture below shows a food chain in a garden.

Diagram for Q3 (P4 Science)

Generated diagram for Q3.

What does the arrow in the food chain above represent? A) The direction of water flow. B) The flow of energy from the organism being eaten to the eater. C) The direction of movement of the animals. D) The growth of the organisms.

_______ (2 marks)

4. A group of students observe a pond. They find small fish eating tiny water plants, and a larger fish eating the small fish. Which of the following is most likely true? A) The small fish are producers. B) The water plants are consumers. C) The larger fish is a predator of the small fish. D) There is no relationship between the plants and the fish.

_______ (2 marks)

5. In a forest, trees provide shelter for birds. In return, birds help to spread seeds from fruits they eat. This relationship is an example of: A) Competition B) Mutualism C) Parasitism D) Predation

_______ (2 marks)

Section B: Short-Answer Questions (5 questions, 15 marks)

Write your answer in the space provided.

6. Hummingbirds have long, thin beaks that help them reach nectar deep inside flowers. While the hummingbird feeds, it also gets pollen stuck on its head, which it then carries to the next flower. (a) Identify the type of relationship shown between the hummingbird and the flower. (1 mark) (b) Explain how each organism benefits from this relationship. (2 marks) (3 marks)

7. The diagram below shows a food web in a grassland.

Diagram for Q7 (P4 Science)

Generated diagram for Q7.

(a) How many food chains are found in the food web above? (1 mark) (b) If all the frogs were removed from this habitat, how might the number of grasshoppers change in the short term? Explain your answer. (2 marks) (3 marks)

8. A farmer notices that his cabbage plants are being eaten by caterpillars. He decides to introduce ladybugs into his garden because ladybugs eat caterpillars. (a) Name the type of relationship between the ladybugs and the caterpillars. (1 mark) (b) Predict what will happen to the number of caterpillars after the ladybugs are introduced. Explain why. (2 marks) (3 marks)

9. Give one reason why it is important for a forest to have a large variety of different plants and animals. (3 marks) (3 marks)

10. A group of students set up two tanks. Tank A contains only water plants. Tank B contains the same water plants and also some snails. Both tanks are placed in the sun for a week.

Diagram for Q10 (P4 Science)

Generated diagram for Q10.

The students observe that the water in both tanks has bubbles forming on the plants. Explain what the bubbles are made of and why there might be more bubbles in Tank A than in Tank B. (3 marks) (3 marks)

Section C: Structured Questions (10 questions, 15 marks)

Read each question carefully and answer in the space provided. Marks are indicated in brackets [ ].

11. In a food chain, which organisms make their own food using sunlight? [1 mark] ______________________________ (1 mark)

12. A cow eats grass. A farmer eats a hamburger made from the cow. What is the correct order for this food chain? [1 mark] ______________________________ (1 mark)

13. True or False: A carnivore is an animal that eats both plants and other animals. [1 mark] ______________________________ (1 mark)

14. Name one animal that is a herbivore. [1 mark] ______________________________ (1 mark)

15. What is the main source of energy for almost all living things on Earth? [1 mark] ______________________________ (1 mark)

16. A tick attaches itself to a dog and feeds on the dog's blood. Name the type of relationship between the tick and the dog. [1 mark] ______________________________ (1 mark)

17. What do we call an animal that is hunted and eaten by another animal? [1 mark] ______________________________ (1 mark)

18. Draw a simple food chain with three organisms. Use arrows to show the flow of energy. [2 marks] (2 marks)

19. In the food chain below, identify the producer and the secondary consumer. [2 marks] Algae → Small Fish → Big Fish → Human (a) Producer: __________________ (b) Secondary Consumer: _________________ (2 marks)

20. A mangrove swamp has a unique community of plants and animals. The roots of mangrove trees provide a safe hiding place for young fish. The fish help to keep the water clean by eating waste material that could harm the mangrove trees. (a) Explain why the young fish are safe among the mangrove roots. [1 mark] (b) Predict what might happen to the mangrove trees if all the fish were removed from the swamp. Explain your answer. [1 mark] (2 marks)

- End of Quiz -

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Answers

Answer Key: Primary 4 Science Quiz - Living Together

Total Marks: 40

Section A: Multiple-Choice Questions (5 × 2 = 10 marks)

1. Answer: B) Photosynthesis Marks: 2 Explanation: Photosynthesis is the process where plants use sunlight, carbon dioxide, and water to make their own food (sugar) and oxygen. Respiration (A) is how living things release energy from food. Germination (C) is when a seed starts to grow. Digestion (D) is the breakdown of food in the body. Common Mistake: Students may confuse respiration with photosynthesis. Remind students that photo means light.

2. Answer: C) A lion hunting and eating a zebra. Marks: 2 Explanation: A predator-prey relationship is when one animal (the predator) hunts and kills another animal (the prey) for food. The lion is the predator and the zebra is the prey. Option A shows mutualism, B shows a consumer eating a producer, and D shows a habitat relationship. Common Mistake: Students may think any interaction between animals is predation. The key is that the prey is killed and eaten.

3. Answer: B) The flow of energy from the organism being eaten to the eater. Marks: 2 Explanation: In a food chain, arrows always point from the food (the organism being eaten) to the eater. This shows the direction in which energy moves. The plant gets energy from the sun, the caterpillar eats the plant and gets energy, then the bird eats the caterpillar.

4. Answer: C) The larger fish is a predator of the small fish. Marks: 2 Explanation: The larger fish eats the small fish, so it is a predator. The small fish are prey. Water plants are producers because they make their own food. The small fish are consumers. There is a clear feeding relationship, so D is incorrect. Common Mistake: Students may think "predator" only refers to large land animals. Any organism that hunts and eats another is a predator.

5. Answer: B) Mutualism Marks: 2 Explanation: Mutualism is a relationship where both organisms benefit. The tree provides shelter for the bird, and the bird helps the tree by spreading its seeds. Competition (A) is when organisms fight for the same resource. Parasitism (C) is when one benefits and the other is harmed. Predation (D) is when one eats the other.

Section B: Short-Answer Questions (3 + 3 + 3 + 3 + 3 = 15 marks)

6. (a) Answer: Mutualism (1 mark) (b) Answers:

The hummingbird benefits because it gets food (nectar) to eat. (1 mark)
The flower benefits because the hummingbird carries pollen from one flower to another, helping the flower to reproduce (make seeds). (1 mark) (Accept any correct explanation showing how each benefits.)

Explanation: This is a classic example of mutualism. The bird gets energy from the nectar, and the plant gets pollinated. Both species benefit from the interaction.

7. (a) Answer: 3 food chains (1 mark) The three food chains are:

Grass → Rabbit → Snake
Grass → Grasshopper → Frog → Snake
Grass → Grasshopper → Frog (if we stop at frog, but the food web can be read as partial chains too. The standard answer for this specific web is 3, assuming we follow complete chains to the top predator. Some mark schemes accept 2 or 3; the safest answer here is 3.)

(b) Answer: The number of grasshoppers would increase. (1 mark) Explanation: The frogs eat grasshoppers. If the frogs are removed, there is no predator to eat the grasshoppers. With fewer grasshoppers being eaten, more of them will survive and reproduce, so their population will increase. (1 mark)

Common Mistake: Students might say the number of grasshoppers will decrease because frogs are gone. They need to understand that predators control prey populations.

8. (a) Answer: Predator-prey relationship (OR "Predation") (1 mark)

(b) Answer: The number of caterpillars will decrease. (1 mark) Explanation: Ladybugs eat caterpillars. With more ladybugs (predators) in the garden, more caterpillars will be eaten. This will cause the caterpillar population to go down. (1 mark) (Accept: "drop", "reduce", "go down")

9. Answer: If there is a large variety of plants and animals (biodiversity), the forest ecosystem is more stable and can recover from changes. For example, if one type of food plant dies out, animals can eat other plants. (3 marks) Marking Scheme:

1 mark: Recognises that plants/animals rely on each other or that variety provides more food options.
2 marks: Links variety to food chains or habitat needs.
3 marks: Explains that a loss of one species won't cause the whole ecosystem to collapse, OR describes a specific example (e.g., "If caterpillars run out, birds can eat berries instead."). (Accept any reasonable explanation showing understanding of interdependence and stability.)

10. Answer: The bubbles are made of oxygen gas (1 mark) produced by the water plants during photosynthesis. There are more bubbles in Tank A because Tank A has only plants and no snails. In Tank B, the snails breathe in oxygen and release carbon dioxide. The plants in Tank B use some of the oxygen they produce for themselves and some is used by the snails. (2 marks)

Explanation: Plants photosynthesize and produce oxygen as a waste product. In Tank A, all the oxygen released by plants forms bubbles. In Tank B, snails are consumers that respire, so they take in oxygen from the water. This means less oxygen is available to form bubbles. Common Mistake: Students may think snails "eat" the bubbles. Explain that snails need oxygen to breathe, just like fish, and they take it from the water.

Section C: Structured Questions (1 × 10 = 10 marks for questions 11-20, plus 5 extra marks from questions 18, 19, 20 = 15 total)

11. Answer: Producers (OR Plants) [1 mark] Explanation: Producers are organisms that make their own food through photosynthesis, using sunlight.

12. Answer: Grass → Cow → Human [1 mark] Explanation: The grass is the producer, the cow (herbivore) eats the grass, and the human (omnivore) eats the cow. The arrow shows the direction of energy flow.

13. Answer: False [1 mark] Explanation: A carnivore is an animal that eats only other animals (meat). An omnivore eats both plants and animals. A herbivore eats only plants.

14. Answer: Any herbivore e.g., Cow, Deer, Rabbit, Grasshopper, Horse. [1 mark] Explanation: A herbivore is an animal that eats only plants.

15. Answer: The Sun [1 mark] Explanation: Sunlight is the primary source of energy for almost all life on Earth. Plants use it for photosynthesis, and then animals eat plants (or eat other animals that ate plants).

16. Answer: Parasitism (OR Parasite-host relationship) [1 mark] Explanation: The tick benefits by getting food (blood), but the dog is harmed (it loses blood and may get an infection). This is parasitism. The tick is the parasite, the dog is the host.

17. Answer: Prey [1 mark] Explanation: The prey is the animal that is hunted and eaten. The predator is the hunter.

18. Answer: Any correct 3-organism food chain with arrows pointing the right way. Example: Sun → Grass → Rabbit → Fox (For a 3-organism chain without sun: Grass → Rabbit → Fox). Marking Scheme:

1 mark: Correct organisms (producer + consumer + another consumer).
1 mark: Arrows pointing in the correct direction (from the food to the eater). (Do not deduct for including the sun arrow if the chain is still 3 steps, unless the question specified "three organisms". Acceptable answers include Sun→Plant→Rabbit or Plant→Rabbit→Fox.)

19. (a) Answer: Algae [1 mark] (b) Answer: Big Fish [1 mark] Explanation: The producer is always the first organism (Algae, makes its own food). The secondary consumer is the third organism in the chain. Here: Algae (producer) → Small Fish (primary consumer) → Big Fish (secondary consumer) → Human (tertiary consumer).

20. (a) Answer: The young fish are safe because the mangrove roots provide hiding places from predators (larger fish). [1 mark]

(b) Answer: The mangrove trees might be harmed/start to decline. (1 mark) Explanation: The fish help keep the water clean by eating waste material that could harm the trees. If the fish are removed, waste material will build up, which could damage the mangrove trees. (1 mark) (Accept explanation that the mutualistic relationship is broken; both organisms would suffer or the system becomes unbalanced.)

- End of Answer Key -