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Primary 4 Science Practice Paper 4
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Questions
TuitionGoWhere Practice Paper - Science Primary 4
TuitionGoWhere Practice Paper (AI)
Subject: Science
Level: Primary 4
Paper: Practice Paper (Version 4 of 5)
Duration: 1 hour
Total Marks: 60
Name: _________________________ Class: _________ Date: ___________
Instructions
- This paper consists of Section A and Section B.
- Answer all questions.
- Write your answers in the spaces provided.
- Use dark blue or black pen.
- For questions involving calculations, show your working clearly.
Section A: Multiple Choice (20 marks)
Choose the correct answer for each question. Each question carries 2 marks.
1. Which of the following is not a characteristic of living things?
A) They can reproduce
B) They can grow
C) They can rust
D) They can respond to stimuli
2. A scientist is classifying some organisms. Which feature would be most useful for putting animals into groups?
A) Their colour
B) Whether they have a backbone
C) Their size
D) Where they live
3. Look at the classification key below.
<image_placeholder> id: Q3-fig1 type: diagram linked_question: Q3 description: A simple dichotomous key with 4 steps for classifying animals labels: Step 1: "Does it have wings?", Step 2a: "Yes → Bird", Step 2b: "No → Go to Step 3", Step 3: "Does it have fins?", Step 4a: "Yes → Fish", Step 4b: "No → Mammal" values: N/A must_show: Clear branching structure with yes/no decisions, arrows connecting steps, and four final categories: Bird, Fish, Mammal, and a fourth branch </image_placeholder>
An animal does not have wings and does not have fins. According to this key, the animal is classified as a
A) Bird
B) Fish
C) Mammal
D) Reptile
4. Which group of organisms includes only non-living things?
A) Cloud, rock, bacteria
B) Water, air, plastic bottle
C) Seed, soil, sunlight
D) Mushroom, moss, mushroom spore
5. The table below shows information about four animals.
<image_placeholder> id: Q5-fig1 type: table linked_question: Q5 description: A comparison table of four animals with their features labels: Column headers: "Animal", "Has Backbone", "Lays Eggs", "Has Feathers"; Row 1: "Penguin", "Yes", "Yes", "Yes"; Row 2: "Frog", "Yes", "Yes", "No"; Row 3: "Butterfly", "No", "Yes", "No"; Row 4: "Whale", "Yes", "No", "No" values: As shown in labels must_show: Complete table with all four animals and their three characteristics clearly visible </image_placeholder>
Based on the table, which statement is correct?
A) All animals with backbones lay eggs.
B) Only animals with feathers lay eggs.
C) The butterfly is the only animal without a backbone.
D) The whale is cold-blooded.
6. Which of the following shows the correct order of classification from the largest group to the smallest group?
A) Kingdom → Species → Genus → Family
B) Kingdom → Phylum → Class → Order → Family → Genus → Species
C) Species → Genus → Family → Kingdom
D) Species → Genus → Order → Class
7. Seeds can be classified by how they are dispersed. Which seed structure is not correctly matched to its dispersal method?
A) Wings — wind dispersal
B) Hooked hairs — animal dispersal
C) Fleshy fruit — water dispersal
D) Explosive pod — self-dispersal
8. Look at the diagram of the flower parts below.
<image_placeholder> id: Q8-fig1 type: diagram linked_question: Q8 description: A simple diagram of a flower showing main parts with labels A, B, C, D labels: Label A at the top of the flower (petal), Label B in the centre (stigma/style), Label C below the centre (ovary), Label D at the base (sepal) values: N/A must_show: Cross-section or simplified flower with four labeled parts A-D, clear pointer lines, and basic flower structure visible </image_placeholder>
Which part produces the seeds after pollination?
A) Part A
B) Part B
C) Part C
D) Part D
9. Siti collected some leaves from her neighbourhood. She noticed they had different shapes. To find out if leaf shape is related to the amount of sunlight, she should
A) ask her friends what they think
B) look at one leaf and guess
C) measure the leaves and record where each was found
D) only collect leaves from sunny places
10. Which pair of organisms are most closely related?
A) Rose and mushroom
B) Bacteria and amoeba
C) Eagle and penguin
D) Grass and grasshopper
Section B: Short Answer Questions (24 marks)
Answer all questions in the spaces provided. Show your working where necessary.
11. David found four objects in his garden: a stone, a puddle of water, a worm, and a plastic toy. [3 marks]
(a) Classify these objects into living and non-living. Write your answer in the table below. [2 marks]
| Living | Non-living |
|---|---|
(b) Give one reason why you put the worm in the "living" group. [1 mark]
12. The diagram below shows how vertebrates can be classified into smaller groups.
<image_placeholder> id: Q12-fig1 type: diagram linked_question: Q12 description: A classification flow chart for vertebrates showing branching groups labels: Top box: "Vertebrates (animals with backbones)"; First branch: "Warm-blooded" and "Cold-blooded"; Under Warm-blooded: "Have feathers → Birds" and "Have hair/fur → Mammals"; Under Cold-blooded: "Have scales, lay eggs with soft shells → Reptiles", "Have scales, live in water → Fish", and "Have moist skin → Amphibians" values: N/A must_show: Complete branching diagram from Vertebrates down to five groups: Birds, Mammals, Reptiles, Fish, Amphibians; clear decision points at each branch </image_placeholder>
(a) Using the diagram, explain why a snake is classified as a reptile. [2 marks]
(b) A student says, "All cold-blooded animals live in water." Is the student correct? Use the diagram to explain your answer. [2 marks]
13. Mei Ling wants to find out if different types of seeds need different amounts of water to germinate. She sets up an experiment with three types of seeds: bean, corn, and sunflower. [4 marks]
(a) What is the changed variable (independent variable) in her experiment? [1 mark]
(b) What two things must she keep the same to make it a fair test? [2 marks]
(c) After one week, Mei Ling records whether each seed has germinated. What other measurement could she take to compare how well the seeds are growing? [1 mark]
14. The table below shows some characteristics of four plants found in Singapore. [4 marks]
<image_placeholder> id: Q14-fig1 type: table linked_question: Q14 description: A table comparing four plants found in Singapore with their features labels: Column headers: "Plant", "Has flowers", "Has woody stem", "Has needles/leaves"; Row 1: "Hibiscus", "Yes", "No", "Leaves"; Row 2: "Rain tree", "Yes", "Yes", "Leaves"; Row 3: "Fern", "No", "No", "Leaves"; Row 4: "Pine tree", "Yes", "Yes", "Needles" values: As shown in labels must_show: Complete table with four plants and three characteristics; all yes/no entries clearly visible </image_placeholder>
(a) Using the information in the table, complete this sentence:
A plant that has flowers but no woody stem is the ________________. [1 mark]
(b) Based on the table, suggest one way to group the plants into flowering plants and non-flowering plants. [1 mark]
(c) The rain tree and pine tree are both woody plants. Give one difference between them using information from the table. [1 mark]
(d) Why is the fern classified as a non-flowering plant? [1 mark]
15. Animals can be classified by what they eat. The Venn diagram below shows information about herbivores, carnivores, and omnivores. [3 marks]
<image_placeholder> id: Q15-fig1 type: diagram linked_question: Q15 description: A Venn diagram with three overlapping circles for herbivores, carnivores, and omnivores labels: Left circle: "Herbivores (eat plants)"; Right circle: "Carnivores (eat animals)"; Overlapping region: "Omnivores (eat both)"; Examples placed: "Rabbit, cow, goat" in Herbivores only; "Lion, snake, eagle" in Carnivores only; "Human, bear, crow, chicken" in the overlapping region values: N/A must_show: Three properly overlapping circles with labels and example animals in correct regions; clear distinction between the three categories </image_placeholder>
(a) Name one animal from the diagram that is an omnivore. [1 mark]
(b) A student says, "Crows are carnivores because they sometimes eat small insects." Use the Venn diagram to explain why this statement is incorrect. [2 marks]
16. The diagram shows the life cycles of two different organisms. [4 marks]
<image_placeholder> id: Q16-fig1 type: diagram linked_question: Q16 description: Two life cycle diagrams side by side for comparison labels: Diagram A (Butterfly): "Egg → Caterpillar → Pupa → Adult Butterfly" with circular arrows; Diagram B (Grasshopper): "Egg → Nymph (small, no wings) → Nymph (larger, wing buds) → Adult Grasshopper" with circular arrows; Text above: "A = Complete Metamorphosis" and "B = Incomplete Metamorphosis" values: N/A must_show: Two complete circular life cycles with stages clearly labeled; visual differences between pupa stage (Diagram A) and gradual nymph stages (Diagram B); wing development visible in Diagram B </image_placeholder>
(a) What is the main difference between complete metamorphosis and incomplete metamorphosis? [2 marks]
(b) A scientist discovers a new insect. The young insect looks like a small adult but has no wings. Which type of metamorphosis does this insect have? Explain your answer. [2 marks]
17. The picture below shows a food chain in a garden pond. [4 marks]
<image_placeholder> id: Q17-fig1 type: diagram linked_question: Q17 description: A simple food chain diagram for a garden pond ecosystem labels: "Pondweed (plant) → Tadpole → Small fish → Kingfisher (bird)"; Arrows show energy flow direction; Text below: "Pondweed makes its own food using sunlight" values: N/A must_show: Linear food chain with four organisms in correct order; arrows pointing from food source to consumer; sun symbol near pondweed; clear labels for each organism </image_placeholder>
(a) Name the producer in this food chain. [1 mark]
(b) What does the arrow between the tadpole and the small fish show? [1 mark]
(c) If all the pondweed died, explain what would happen to the small fish population. [2 marks]
Section C: Application Questions (16 marks)
Answer all questions. Show your reasoning clearly.
18. A group of P4 students visited the Singapore Botanic Gardens. Their teacher asked them to observe and classify the plants they saw. [6 marks]
(a) The students found these plants: a tall tree with rough bark and seeds in cones, a small plant with colourful flowers and soft stems, and a plant with large divided leaves but no flowers.
Using what you know about plant classification, complete the table below. [3 marks]
| Plant Description | Likely Group | Reason |
|---|---|---|
| Tall tree with cones | ||
| Small plant with colourful flowers | ||
| Plant with large divided leaves, no flowers |
(b) The teacher explains that botanists (plant scientists) sometimes find it hard to classify plants. Suggest one reason why plant classification can be difficult. [1 mark]
(c) The students want to find out if plants with thicker stems lose water more slowly. Describe how they could carry out a fair test to investigate this. [2 marks]
19. Rahim set up an investigation to find out which habitat has the most diversity of living things. He surveyed three places: a grassy field, a concrete playground, and a pond with plants. [5 marks]
(a) What does "diversity of living things" mean? [1 mark]
(b) Predict which habitat would have the most diversity. Explain your prediction using ideas about what living things need. [2 marks]
(c) In his survey, Rahim found 3 types of ants, 2 types of grass, 1 type of beetle, and 4 types of birds in the grassy field. Calculate the total number of different types of living things he found there. [1 mark]
(d) Give one reason why a concrete playground might have low diversity. [1 mark]
20. The figure below shows how recycling helps reduce waste and protect diversity in nature. [5 marks]
<image_placeholder> id: Q20-fig1 type: diagram linked_question: Q20 description: A cycle diagram showing the recycling process and its benefits labels: Top left: "Used paper and plastic collected"; Arrow to: "Recycling factory" with "Less rubbish in landfills"; Arrow to: "New paper and plastic products"; Arrow to: "Less need to cut trees / drill for oil"; Arrow to: "Forests and habitats protected"; Arrow back to: "More homes for animals and plants = more diversity" values: N/A must_show: Circular flow diagram with five stages; arrows showing direction of cycle; clear connections between recycling and habitat protection; final link back to diversity </image_placeholder>
(a) According to the diagram, how does recycling help protect habitats? [2 marks]
(b) Explain why protecting forests helps maintain diversity of living things. [2 marks]
(c) Besides recycling, give one action you can take at home to help protect diversity. [1 mark]
END OF PAPER
Check your work before handing in your paper.
Answers
TuitionGoWhere Practice Paper - Science Primary 4
Answer Key — Version 4
Section A: Multiple Choice (20 marks)
1. Answer: C) They can rust [2 marks]
Explanation: Living things share seven characteristics: they can move, respire, grow, reproduce, excrete, respond to stimuli, and need nutrition. Rusting is a chemical reaction that happens to non-living metals like iron when exposed to water and air. It is not a process that living things do. Rocks and metal objects can rust, but they are not alive.
2. Answer: B) Whether they have a backbone [2 marks]
Explanation: The presence or absence of a backbone (vertebrae) is a fundamental way to classify animals. Vertebrates (animals with backbones) include fish, amphibians, reptiles, birds, and mammals. Invertebrates (animals without backbones) include insects, worms, spiders, and crustaceans. While colour, size, and habitat can vary within a group and are less reliable for classification, the backbone feature clearly separates animals into two major groups that share important structural and functional similarities.
3. Answer: C) Mammal [2 marks]
Explanation: Following the dichotomous key step by step: Step 1 asks "Does it have wings?" → The animal does NOT have wings, so follow "No" to Step 3. Step 3 asks "Does it have fins?" → The animal does NOT have fins, so follow "No" to the conclusion "Mammal." Birds have wings, fish have fins, and mammals (like dogs, cats, humans) typically have neither wings nor fins. Note: While bats are mammals with wings, this simple key places winged animals in the Bird category for basic classification purposes.
4. Answer: B) Water, air, plastic bottle [2 marks]
Explanation: Non-living things do not have any of the life characteristics. Water and air are natural non-living substances; a plastic bottle is a man-made object. Option A includes bacteria (living). Option C includes a seed (living, as it can germinate). Option D includes mushroom, moss, and mushroom spore (all living or capable of becoming living).
5. Answer: C) The butterfly is the only animal without a backbone. [2 marks]
Explanation: Checking each statement against the table:
- A is incorrect: The whale has a backbone but does not lay eggs (it gives birth to live young).
- B is incorrect: The frog, butterfly, and penguin all lay eggs, but only the penguin has feathers.
- C is correct: Penguin (yes), frog (yes), whale (yes), butterfly (no) — the butterfly is indeed the only invertebrate.
- D is incorrect: The table does not show information about body temperature, but whales are warm-blooded mammals, not cold-blooded.
6. Answer: B) Kingdom → Phylum → Class → Order → Family → Genus → Species [2 marks]
Explanation: Biological classification follows a hierarchical system from the largest, most inclusive group to the smallest, most specific group. The order is: Kingdom (e.g., Animalia), Phylum (e.g., Chordata), Class (e.g., Mammalia), Order (e.g., Primates), Family (e.g., Hominidae), Genus (e.g., Homo), Species (e.g., sapiens). This system was developed by Carl Linnaeus and helps scientists organize the diversity of life. Options A and D have incorrect ordering; C is completely reversed.
7. Answer: C) Fleshy fruit — water dispersal [2 marks]
Explanation: Fleshy fruits are typically dispersed by animals (including birds and humans). Animals eat the fleshy part and either discard the seeds or pass them out in droppings, often far from the parent plant. Water-dispersed seeds usually have adaptations like air spaces or fibrous husks that allow them to float (e.g., coconut). Wings (A), hooked hairs (B), and explosive pods (D) are all correctly matched to their dispersal methods.
8. Answer: C) Part C [2 marks]
Explanation: In the flower diagram, Part C is the ovary. After pollination (when pollen reaches the stigma, Part B), the fertilized egg cells develop into seeds inside the ovary. The ovary itself develops into the fruit that contains and protects the seeds. Part A (petal) attracts pollinators; Part B (stigma/style) receives pollen; Part D (sepal) protects the flower bud before it opens.
9. Answer: C) measure the leaves and record where each was found [2 marks]
Explanation: To investigate a possible relationship between leaf shape and sunlight, Mei Ling needs to collect systematic data — measuring the leaves (quantitative data about shape/size) and recording their location (sunlight exposure as a variable). This allows her to look for patterns or correlations. Asking friends (A) is not scientific evidence; looking at one leaf (B) gives insufficient data; only collecting from sunny places (D) makes it impossible to compare with shaded areas.
10. Answer: C) Eagle and penguin [2 marks]
Explanation: Eagles and penguins are both birds — they share the same class (Aves) in biological classification. They both have feathers, beaks, lay hard-shelled eggs, and are warm-blooded vertebrates. Option A: rose (plant, Kingdom Plantae) and mushroom (fungus, Kingdom Fungi) are in different kingdoms. Option B: bacteria (Kingdom Bacteria/Monera) and amoeba (Kingdom Protozoa/Protista) are different kingdoms. Option D: grass (plant) and grasshopper (animal) are in different kingdoms.
Section B: Short Answer Questions (24 marks)
11. (a)
| Living | Non-living |
|---|---|
| Worm | Stone |
| Water | |
| Plastic toy |
Marking: [2 marks] — 1 mark for correct living item; 1 mark for all three non-living items correct.
Explanation: The worm is living because it moves, respires, grows, reproduces, needs food, responds to stimuli, and excretes waste. The stone, water, and plastic toy do not show any life characteristics.
(b) Answer: The worm can move / needs food / can reproduce / grows / responds to stimuli. [1 mark]
Accept any valid life characteristic with brief explanation. Example: "The worm needs food to stay alive and grows bigger over time, which shows it is living."
12. (a) Answer: A snake is cold-blooded, has scales, and lays eggs with soft shells. [2 marks]
Marking breakdown:
- 1 mark: Mentions TWO correct features from the diagram (cold-blooded, has scales, lays eggs with soft shells)
- 1 mark: States these features match the reptile branch of the diagram
Explanation: Following the classification diagram from "Vertebrates," the snake is cold-blooded (does not maintain constant body temperature), so we follow the "Cold-blooded" branch. Among cold-blooded animals, the snake has scales and lays eggs with soft shells — this matches the "Reptiles" branch, not fish (live in water) or amphibians (moist skin).
(b) Answer: The student is incorrect. [1 mark] Not all cold-blooded animals live in water. [1 mark]
Explanation: According to the diagram, cold-blooded animals include reptiles, fish, AND amphibians. While fish live in water, reptiles (like snakes and lizards) and amphibians (like frogs) can live on land. Cold-bloodedness means their body temperature changes with the environment, not that they must live in water.
13. (a) Answer: The type of seed / kind of seed (bean, corn, or sunflower). [1 mark]
Explanation: The independent variable is what the experimenter deliberately changes. Mei Ling is testing three different types of seeds, so this is the variable she changes to see if it affects germination.
(b) Answer: Any TWO from: [2 marks]
- Amount of water given to each seed
- Temperature of the environment
- Type/amount of soil used
- Size of container
- Amount of light
Explanation: For a fair test, only ONE variable (the type of seed) should be changed. All other conditions must be kept constant so that any differences in germination can be attributed to the seed type, not to other factors.
(c) Answer: Height of seedling / number of leaves / mass of seedling / length of root [1 mark]
Explanation: Beyond simply recording whether germination occurred (yes/no), quantitative measurements allow better comparison. Height is the most practical measurement for young seedlings.
14. (a) Answer: Hibiscus [1 mark]
Explanation: Looking at the table, only the hibiscus has "Yes" for flowers and "No" for woody stem.
(b) Answer: Group by whether they have flowers or not. [1 mark]
Explanation: Flowering plants (hibiscus, rain tree, pine tree) all have "Yes" in the flowers column; non-flowering plant (fern) has "No." This separates the plants into two clear groups: angiosperms/gymnosperms (flowering/seed-producing) and spore-producing plants.
(c) Answer: The rain tree has leaves; the pine tree has needles. [1 mark]
Explanation: Both have woody stems and flowers, but their leaf types differ. Rain trees have broad, flat leaves typical of flowering trees; pine trees have needle-like leaves, an adaptation to reduce water loss.
(d) Answer: Because it does not produce flowers. [1 mark]
Explanation: Ferns reproduce using spores, not seeds or flowers. They are classified as non-flowering plants (pteridophytes) in the plant kingdom.
15. (a) Answer: Human / bear / crow / chicken [1 mark]
Accept any one correct answer.
<image_placeholder_interpretation> Expected visual: The Venn diagram shows human, bear, crow, and chicken in the overlapping region between herbivores and carnivores, labeled as "Omnivores (eat both)." </image_placeholder_interpretation>
(b) Answer: The student is incorrect because crows are in the overlapping region. [1 mark] This means crows eat BOTH plants and animals, making them omnivores, not carnivores. [1 mark]
Explanation: Looking at the Venn diagram, carnivores (lion, snake, eagle) are located only in the "Carnivores" circle. Crows appear in the intersection/overlap between herbivores and carnivores, which represents omnivores — animals that consume both plant and animal matter. While crows may eat insects (animals), they also eat grains, fruits, and seeds (plants).
16. (a) Answer: In complete metamorphosis, there is a pupa stage where the young looks completely different from the adult. [1 mark] In incomplete metamorphosis, there is no pupa; the young looks like a small adult and gradually develops wings. [1 mark]
Explanation: The key distinction is the presence or absence of a pupal/chrysalis stage. Complete metamorphosis (holometabolism): egg → larva (e.g., caterpillar, looks nothing like adult) → pupa (resting/transforming stage) → adult. Incomplete metamorphosis (hemimetabolism): egg → nymph (resembles adult but smaller, wingless or with wing buds) → adult (wings fully developed). The nymph molts several times, growing larger each time.
(b) Answer: Incomplete metamorphosis. [1 mark] The young looks like a small adult but has no wings, which matches the nymph stage in incomplete metamorphosis. [1 mark]
Explanation: This describes exactly what happens in incomplete metamorphosis — nymphs resemble miniature adults but lack fully developed wings (they have wing buds that grow with each molt). In complete metamorphosis, the larva looks completely different from the adult (e.g., caterpillar vs. butterfly), so "looks like a small adult" rules out complete metamorphosis.
17. (a) Answer: Pondweed [1 mark]
Explanation: Producers are organisms that make their own food through photosynthesis, using sunlight energy. The diagram notes "Pondweed makes its own food using sunlight." Pondweed is a green plant that contains chlorophyll and can perform photosynthesis. All other organisms in the food chain are consumers that must eat other organisms to obtain energy.
(b) Answer: The tadpole is eaten by the small fish. / Energy passes from tadpole to small fish. [1 mark]
Explanation: Arrows in food chains show the direction of energy flow, pointing from the food source to the consumer. The arrow from tadpole to small fish indicates that the small fish eats the tadpole, thereby obtaining energy from it.
(c) Answer: The small fish population would decrease. [1 mark] Because there would be no food for the tadpoles, so tadpoles would die; then small fish would have no tadpoles to eat. [1 mark]
Explanation: Food chains show interdependence. If the producer (pondweed) dies, the primary consumers (tadpoles) have no food source and will die. Without tadpoles, the secondary consumers (small fish) lose their food source and will also decrease in number. This demonstrates how removing one level affects all other levels in a food chain.
Section C: Application Questions (16 marks)
18. (a)
| Plant Description | Likely Group | Reason |
|---|---|---|
| Tall tree with cones | Conifer / Gymnosperm | Has cones instead of flowers; woody |
| Small plant with colourful flowers | Flowering plant / Angiosperm | Has flowers and soft stem |
| Plant with large divided leaves, no flowers | Fern / Non-flowering plant | Reproduces by spores, not flowers |
Marking: [3 marks] — 1 mark per correct row (group and reason must match)
Explanation:
- Conifers (gymnosperms) have naked seeds in cones, not enclosed in fruits. They are woody plants with needle-like or scale-like leaves.
- Angiosperms (flowering plants) produce seeds enclosed in fruits, developed from flowers. They may be woody or herbaceous (soft-stemmed).
- Ferns are seedless vascular plants that reproduce via spores, not flowers or seeds.
(b) Answer: Some plants look very similar / some plants have features of more than one group / new plants are discovered that don't fit existing groups / classification systems keep changing as we learn more. [1 mark]
Accept any reasonable suggestion.
(c) Answer: Select plants with stems of different thicknesses. [1 mark] Water them equally and place them in the same conditions; measure how much water is lost (by weighing) over the same time period. [1 mark]
Explanation: This is a controlled experiment. The changed variable (independent) is stem thickness. Measured variable is water loss. Controlled variables: amount of water given initially, temperature, light, humidity, time period, and possibly leaf area (to ensure comparison is fair — same leaf area means the stem thickness is the true difference being tested).
19. (a) Answer: Diversity means having many different types or kinds of living things in a place. [1 mark]
Explanation: Biodiversity refers to the variety of life forms — different species, genetic differences within species, and the variety of ecosystems. In this context, it means counting how many different species or types of organisms are present.
(b) Answer: The pond with plants would have the most diversity. [1 mark] Because ponds have water, plants for food, shelter for small animals, and support many different needs of living things. [1 mark]
Explanation: Ponds provide multiple habitats (water surface, underwater, bottom mud, edges with plants) and resources (water, food, shelter, breeding places). Living things need water, food, air, and shelter to survive. A grassy field has fewer microhabitats; a concrete playground lacks most resources living things need, especially producers (plants) that form the base of food chains.
(c) Answer: 3 + 2 + 1 + 4 = 10 types [1 mark]
Explanation: "Types" means different species. Add: 3 (ants) + 2 (grasses) + 1 (beetle) + 4 (birds) = 10 different types of living things. This is a species richness count.
(d) Answer: Concrete does not provide food / water / shelter / soil for plants to grow. [1 mark]
Explanation: Concrete is an impermeable, artificial surface. It prevents soil and plant growth, eliminating producers from the habitat. Without producers, there is no energy entering the food chain, so few consumers can survive there either. Limited water absorption and high temperatures also make concrete inhospitable.
20. (a) Answer: Recycling means less rubbish in landfills, [1 mark] which means less need to cut trees or drill for oil, so forests and habitats stay protected. [1 mark]
Explanation: Following the cycle diagram: recycling reduces waste → less demand for raw materials → less habitat destruction → protected forests. The key chain of reasoning is understanding how reducing raw material extraction directly preserves natural habitats.
(b) Answer: Forests provide homes/shelter for many animals and plants. [1 mark] If forests are protected, more different species can survive there, maintaining diversity. [1 mark]
Explanation: Forests are complex ecosystems with multiple layers (canopy, understory, forest floor) that provide diverse niches — food sources, nesting sites, protection from predators, and microclimates. Destroying forests removes these resources, causing species to die out or migrate, reducing diversity. Protection maintains these habitats and the species that depend on them.
(c) Answer: Any ONE reasonable action: use less plastic / reuse containers / compost food waste / save water / use both sides of paper / plant more plants / don't litter. [1 mark]
Explanation: The action should logically reduce environmental impact and thereby help protect habitats and diversity. Practical home actions that reduce resource consumption or waste production are most relevant.
Total Marks: 60 ✓
End of Answer Key