From Real Exams Exam Paper
Primary 4 Science Semestral Assessment 2 (End of Year) Paper 4
Free Exam-Derived Owl Alpha Primary 4 Science Semestral Assessment 2 (End of Year) Paper 4 practice paper with questions and answers for Singapore students. This page is rendered as a direct URL so the questions and answers can be discovered without pressing in-page buttons.
These static practice materials are generated from the site's syllabus and paper-generation workflow, with source and model context shown so students and parents can evaluate the material before use.
Questions
TuitionGoWhere Practice Paper - Science Primary 4
School: TuitionGoWhere Secondary School (AI) Subject: Science Level: Primary 4 Paper: SA2 (End-of-Year Examination) Version: 4 of 5 Duration: 60 minutes Total Marks: 50
Name: ________________________ Class: ________________________ Date: ________________________
Instructions to Candidates
- Write your name, class, and date in the spaces provided above.
- Answer ALL questions in the spaces provided.
- Do not use correction fluid or tape.
- The use of calculators is not allowed.
- This paper consists of Section A, Section B, and Section C.
- Check that all pages are present before you begin.
Section A: Multiple Choice Questions (10 marks)
Questions 1–10: Choose the most accurate answer (A, B, C, or D). Each question carries 1 mark. Shade your answer clearly on the answer sheet provided.
1. Which of the following is a living thing?
A. A plastic bottle B. A wooden chair C. A potted plant D. A metal spoon
2. Which characteristic do ALL living things share?
A. They can fly. B. They can grow. C. They are green in colour. D. They live on land.
3. A fish is different from a bird because a fish __________.
A. has feathers B. breathes through lungs C. has fins to move in water D. gives birth to live young
4. Which of the following is a non-living thing?
A. A caterpillar B. A mushroom C. A river D. A frog
5. Living things need __________ to survive.
A. sunlight only B. water only C. food, water, and air D. soil only
6. Which group of living things can make their own food?
A. Animals B. Plants C. Fungi D. Bacteria
7. What is one way to tell a living thing apart from a non-living thing?
A. A living thing is always bigger. B. A living thing can reproduce. C. A living thing is always found outdoors. D. A living thing never moves.
8. Which of the following is NOT a characteristic of living things?
A. They respond to changes around them. B. They need food and water. C. They are always visible to the naked eye. D. They grow and develop.
9. A cat and a dog are similar because both __________.
A. have feathers B. breathe through gills C. are mammals that feed their young with milk D. lay eggs
10. Which of the following best describes biodiversity?
A. Only one type of living thing in an area B. Many different types of living things in an area C. Only plants in a garden D. Only animals in a forest
Section B: Short Answer Questions (20 marks)
Questions 11–15: Write your answers in the spaces provided. Show your reasoning where required.
11. (2 marks) State two characteristics that all living things share.
12. (2 marks) The table below shows four objects. Classify each as Living or Non-living.
| Object | Living or Non-living? |
|---|---|
| Grass | |
| Rock | |
| Butterfly | |
| Cloud |
13. (3 marks) Study the pictures of two animals below (described):
- Animal X: Has scales, lays eggs, lives in water, breathes through gills.
- Animal Y: Has fur, gives birth to live young, breathes through lungs.
(a) (1 mark) Identify one way Animal X and Animal Y are different.
(b) (2 marks) Explain why both Animal X and Animal Y are classified as living things.
14. (4 marks) A student found the following items in a garden: an ant, a flower, a stone, a worm, and a puddle of water.
(a) (1 mark) How many living things did the student find?
(b) (3 marks) For one of the living things you identified, explain two reasons why it is considered a living thing.
Living thing chosen: ___________________________________________
Reason 1: _____________________________________________________
Reason 2: _____________________________________________________
15. (4 marks) The diagram below (described) shows a simple food chain:
Grass → Grasshopper → Frog → Snake
(a) (1 mark) Which organism in the food chain is the producer?
(b) (1 mark) Which organism is the top consumer?
(c) (2 marks) Explain what would happen to the frog population if all the grasshoppers disappeared.
Section C: Structured / Extended Response Questions (20 marks)
Questions 16–20: Answer all questions. Write your answers in the spaces provided. Use complete sentences where appropriate.
16. (4 marks) A nature reserve has many different types of plants, insects, birds, and fish living in it.
(a) (2 marks) What does the presence of many different types of living things in the nature reserve tell us about its biodiversity?
(b) (2 marks) Give two reasons why it is important to protect biodiversity in a nature reserve.
Reason 1: _____________________________________________________
Reason 2: _____________________________________________________
17. (4 marks) Study the classification table below:
| Group A | Group B |
|---|---|
| Eagle | Goldfish |
| Sparrow | Shark |
| Penguin | Whale |
(a) (2 marks) What is the main difference between the animals in Group A and Group B?
(b) (2 marks) The whale breathes through lungs, not gills. Explain why a whale is still classified as a living thing, and state one characteristic it shares with other mammals.
18. (4 marks) A student observed four organisms in a pond ecosystem and recorded the following:
- Organism 1: Green, rooted in soil underwater, makes food using sunlight.
- Organism 2: Small, swims freely, eats tiny plants in the water.
- Organism 3: Transparent, drifts with the current, very small.
- Organism 4: Sits on a rock at the edge, does not move, has a hard shell.
(a) (2 marks) Which organism is a plant? Explain your answer.
(b) (2 marks) Organism 4 does not move from its position. Explain why it is still considered a living thing.
19. (4 marks) The table below shows the features of three unknown organisms:
| Feature | Organism P | Organism Q | Organism R |
|---|---|---|---|
| Has feathers | Yes | No | No |
| Can fly | Yes | No | Yes |
| Lays eggs | Yes | Yes | Yes |
| Has lungs | Yes | Yes | Yes |
| Warm-blooded | Yes | No | Yes |
(a) (2 marks) Organism P is most likely a __________. Give one reason from the table.
(b) (2 marks) Organism Q is most likely a __________. Explain your reasoning using two pieces of evidence from the table.
20. (4 marks) Read the following scenario and answer the question:
A group of students visited a mangrove swamp. They saw mudskippers, crabs, mangrove trees, algae, water snakes, kingfishers, and monitor lizards. They also noticed fallen leaves, muddy water, and rocks.
(a) (2 marks) List three living things the students observed.
(b) (2 marks) Explain two ways in which the living things in a mangrove swamp depend on each other for survival.
END OF PAPER
Check your work before submitting.
Answers
TuitionGoWhere Practice Paper - Science Primary 4
SA2 Answer Key — Version 4 of 5
Total Marks: 50
Section A: Multiple Choice Questions (10 marks)
1. C — A potted plant is a living thing. Plastic bottles, wooden chairs (made from trees but no longer alive), and metal spoons are non-living.
2. B — All living things can grow. Not all living things can fly, are green, or live on land (e.g., fish live in water).
3. C — A fish has fins to move in water, while a bird has feathers and wings. Fish breathe through gills, not lungs, and most fish lay eggs.
4. C — A river is non-living. Caterpillars, mushrooms, and frogs are all living things.
5. C — Living things need food, water, and air to survive. Sunlight is needed by plants but not all living things directly; soil is not required by all living things.
6. B — Plants can make their own food through photosynthesis. Animals and fungi cannot make their own food.
7. B — Living things can reproduce (produce young). Size, location, and visibility are not reliable distinguishing features.
8. C — Not all living things are visible to the naked eye (e.g., bacteria). This is NOT a characteristic of all living things.
9. C — Cats and dogs are both mammals that feed their young with milk. They do not have feathers, do not breathe through gills, and do not lay eggs.
10. B — Biodiversity refers to the variety of different types of living things in an area.
Section B: Short Answer Questions (20 marks)
11. (2 marks) Any two of the following (1 mark each):
- They can grow.
- They need food and water.
- They can reproduce.
- They respond to changes in their surroundings.
- They breathe / respire.
- They can move (in some way).
Marking note: Accept any valid characteristic of living things. Do not accept "they are big" or "they are visible."
12. (2 marks) — ½ mark per correct classification
| Object | Living or Non-living? |
|---|---|
| Grass | Living |
| Rock | Non-living |
| Butterfly | Living |
| Cloud | Non-living |
Marking note: Clouds are non-living (made of water droplets). Grass and butterflies are living. Rocks are non-living.
13. (3 marks)
(a) (1 mark) Any one valid difference, e.g.:
- Animal X has scales while Animal Y has fur.
- Animal X breathes through gills while Animal Y breathes through lungs.
- Animal X lives in water while Animal Y lives on land.
- Animal X lays eggs while Animal Y gives birth to live young.
(b) (2 marks) Both Animal X and Animal Y are living things because:
- They both need food and water to survive (1 mark).
- They both can reproduce / produce young (1 mark).
Accept other valid characteristics: they grow, they respond to changes, they breathe.
Marking note: Students must give two distinct reasons. Award 1 mark per valid reason.
14. (4 marks)
(a) (1 mark) The student found 3 living things (ant, flower, worm).
Marking note: Stone and puddle of water are non-living.
(b) (3 marks) Award 1 mark for naming a valid living thing (ant, flower, or worm) and 2 marks for two valid reasons.
Example answer (ant):
- It can move from place to place (1 mark).
- It needs food and water to survive (1 mark).
Example answer (flower):
- It can grow (1 mark).
- It can reproduce / produce seeds (1 mark).
Marking note: Accept any valid characteristic of living things. Reasons must be specific to the organism chosen.
15. (4 marks)
(a) (1 mark) Grass is the producer.
(b) (1 mark) Snake is the top consumer.
(c) (2 marks) If all the grasshoppers disappeared, the frog population would decrease (1 mark) because frogs depend on grasshoppers as a food source / frogs would not have enough food to eat (1 mark).
Marking note: Students must state the direction of change (decrease) AND give a reason related to food/dependency for full marks.
Section C: Structured / Extended Response Questions (20 marks)
16. (4 marks)
(a) (2 marks) The nature reserve has high biodiversity (1 mark) because there are many different types of living things (plants, insects, birds, and fish) living in the same area (1 mark).
Marking note: Award 1 mark for identifying high biodiversity and 1 mark for explaining the variety.
(b) (2 marks) — 1 mark per reason Any two of the following:
- It helps maintain a balanced ecosystem so that each organism has a role to play.
- It ensures that there is enough food for different animals in the food chain.
- It helps living things adapt to changes in the environment.
- It provides resources (medicine, food, materials) for humans.
- It keeps the environment healthy and stable.
Marking note: Accept any reasonable answer related to ecosystem balance, food chains, or environmental health.
17. (4 marks)
(a) (2 marks) Group A animals (eagle, sparrow, penguin) are birds that can fly or have feathers and live mainly on land/in the air (1 mark), while Group B animals (goldfish, shark, whale) are aquatic animals that live in water (1 mark).
Marking note: Accept any valid distinction — e.g., "Group A are birds, Group B are fish/sea animals" or "Group A can fly, Group B swim."
(b) (2 marks) A whale is a living thing because it breathes through lungs, gives birth to live young, and feeds its young with milk (any 1 valid characteristic, 1 mark). One characteristic it shares with other mammals is that it is warm-blooded / it has fur or hair (some whales have small amounts) / it feeds its young with milk (1 mark).
Marking note: Students may be surprised that whales are mammals. Award marks for any valid mammalian characteristic.
18. (4 marks)
(a) (2 marks) Organism 1 is a plant (1 mark) because it is green, rooted in soil, and makes food using sunlight (photosynthesis) (1 mark).
Marking note: The key evidence is that it "makes food using sunlight" — this is unique to plants.
(b) (2 marks) Organism 4 is still a living thing because:
- It can grow (1 mark).
- It can reproduce / produce young (1 mark).
Accept other valid reasons: it needs food and water, it responds to changes, it breathes.
Marking note: Students should understand that not all living things move from place to place (e.g., barnacles, corals, some molluscs). Award 1 mark per valid reason.
19. (4 marks)
(a) (2 marks) Organism P is most likely a bird (1 mark) because it has feathers (1 mark).
Marking note: Feathers are unique to birds. This is the key identifying feature.
(b) (2 marks) Organism Q is most likely a reptile (e.g., a lizard or crocodile) or an amphibian (e.g., a frog) (1 mark).
Evidence from the table:
- It lays eggs (1 mark).
- It is cold-blooded (not warm-blooded) (1 mark).
Marking note: Accept "reptile" or "amphibian" as the answer. Students must cite two pieces of evidence from the table for full marks. Award 1 mark for the identification and 1 mark for citing two valid pieces of evidence.
20. (4 marks)
(a) (2 marks) — ⅔ mark per living thing (accept any 3) Any three of the following: mudskippers, crabs, mangrove trees, algae, water snakes, kingfishers, monitor lizards.
Marking note: Fallen leaves (detached from tree), muddy water, and rocks are non-living. Do not award marks for these.
(b) (2 marks) — 1 mark per valid explanation Any two of the following:
- Food dependence: Kingfishers eat mudskippers and crabs, so the birds depend on these animals for food. If the fish and crabs disappeared, the kingfishers would have less food.
- Habitat dependence: Mangrove trees provide shelter and nesting sites for kingfishers and monitor lizards.
- Oxygen and carbon dioxide exchange: Mangrove trees and algae produce oxygen that animals need, while animals produce carbon dioxide that plants need.
- Nutrient cycling: Fallen leaves from mangrove trees decompose and provide nutrients for algae and small organisms, which are then eaten by crabs and mudskippers.
Marking note: Accept any reasonable explanation showing interdependence. Award 1 mark per valid, distinct explanation.
END OF ANSWER KEY