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Primary 6 PSLE Science Practice Paper 5

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TuitionGoWhere Practice Paper - Science Primary 6 PSLE

TuitionGoWhere Practice Paper (AI)

Subject: Science Level: Primary 6 (PSLE) Paper: Practice Paper — Diversity (Version 5 of 5) Duration: 1 hour 45 minutes Total Marks: 100

Name: ________________________ Class: ________________________ Date: ________________________

Instructions to Candidates

Write your name, class, and date in the spaces provided above.
Answer all questions in the spaces provided.
Write in dark blue or black pen.
Do not use correction fluid.
The number of marks for each question is shown in brackets [ ].
Diagrams are not drawn to scale unless stated.
You may use a calculator where necessary.
The total mark for this paper is 100.

Section A — Multiple Choice Questions (20 marks)

Questions 1–10: Choose the most accurate answer (A, B, C, or D). Each question carries 2 marks. Shade your answer clearly on the answer sheet provided, or write the letter in the space given.

1. Which of the following is a characteristic used to classify living things into groups?

A) Colour of the organism B) Number of legs only C) Body features and structures D) Size of the organism

Answer: ______ [2]

2. The table below shows four organisms and their features.

Organism	Has feathers	Has fins	Has fur
P	Yes	No	No
Q	No	Yes	No
R	No	No	Yes
S	Yes	No	Yes

Which organism is most likely a bird?

A) P B) Q C) R D) S

Answer: ______ [2]

3. Which of the following is a non-flowering plant that reproduces by spores?

A) Rose plant B) Fern C) Mango tree D) Sunflower

Answer: ______ [2]

4. A student grouped the following animals: bat, whale, penguin, and crocodile. Which characteristic do all four animals share?

A) They can fly. B) They have feathers. C) They breathe through lungs. D) They live in water.

Answer: ______ [2]

5. Which of the following correctly shows the classification of a fern?

A) Plant → Flowering plant → Monocot B) Plant → Non-flowering plant → Fungus C) Plant → Non-flowering plant → Fern D) Plant → Non-flowering plant → Moss

Answer: ______ [2]

6. What is the main difference between monocotyledonous and dicotyledonous plants?

A) Monocots have parallel leaf veins; dicots have network-like leaf veins. B) Monocots have tap roots; dicots have fibrous roots. C) Monocots have two cotyledons; dicots have one cotyledon. D) Monocots are non-flowering; dicots are flowering.

Answer: ______ [2]

7. Which of the following organisms is a fungus?

A) Algae B) Mushroom C) Fern D) Moss

Answer: ______ [2]

8. A scientist found an unknown organism. It has a soft body, a hard shell, and moves using a muscular foot. This organism most likely belongs to which group?

A) Insects B) Molluscs C) Fish D) Amphibians

Answer: ______ [2]

9. Which of the following is a characteristic of all mammals?

A) They lay eggs. B) They have scales. C) They feed their young with milk. D) They live on land only.

Answer: ______ [2]

10. The diagram below (not drawn to scale) shows a classification key.

Living Thing
├── Has backbone (Vertebrate)
│   ├── Has feathers → Bird
│   ├── Has scales, lives in water → Fish
│   ├── Has scales, lives on land → Reptile
│   └── Has fur/hair → Mammal
└── No backbone (Invertebrate)
    ├── Has jointed legs → Arthropod
    └── No jointed legs → Other invertebrates

Using the key above, how would you classify a butterfly?

A) Vertebrate — Mammal B) Vertebrate — Bird C) Invertebrate — Arthropod D) Invertebrate — Other invertebrates

Answer: ______ [2]

Section B — Short-Answer Questions (40 marks)

Questions 11–16: Answer each question in the space provided. Show your working or reasoning where necessary.

11. The table below shows five organisms and some of their characteristics.

Organism	Body covering	Reproduces by	Habitat
Shark	Scales	Live young	Water
Eagle	Feathers	Eggs	Air/Land
Frog	Moist skin	Eggs	Water/Land
Crocodile	Scales	Eggs	Water/Land
Bat	Fur	Live young	Air/Land

(a) Using the information in the table, classify the organisms into two groups based on one observable characteristic. State the characteristic used and list the organisms in each group. [3]

Characteristic used: _________________________________

Group 1: _____________________________________________

Group 2: _____________________________________________

(b) The bat and the eagle can both fly. Explain why the bat is classified as a mammal and not a bird. Give two reasons. [2]

[Total: 5 marks]

12. Study the following organisms: moss, fern, rose plant, and pine tree.

(a) Which of the above organisms are non-flowering plants? [1]

(b) Explain how a fern reproduces if it does not produce flowers or seeds. [2]

(c) Between the rose plant and the pine tree, which is a dicotyledonous plant? Give one observable feature to support your answer. [2]

[Total: 5 marks]

13. A student collected four leaves from different plants and recorded the following observations:

| Leaf | Vein pattern | Number of cotyledons in seed | |------|-------------------------------------------| | W | Parallel | 1 | | X | Network | 2 | | Y | Parallel | 1 | | Z | Network | 2 |

(a) Which leaves come from monocotyledonous plants? [1]

(b) State two other features (besides vein pattern and cotyledon number) that can be used to distinguish monocots from dicots. [2]

Monocot: ________________________________________________

Dicot: ___________________________________________________

[Total: 5 marks]

14. The diagram below shows a simple classification of animals.

Animals
├── Vertebrates (have backbone)
│   ├── Fish
│   ├── Amphibians
│   ├── Reptiles
│   ├── Birds
│   └── Mammals
└── Invertebrates (no backbone)
    ├── Insects
    ├── Arachnids
    ├── Crustaceans
    ├── Molluscs
    └── Others

(a) State two features that all vertebrates have in common. [2]

(b) A spider has eight legs and no antennae. To which invertebrate group does it belong? [1]

[Total: 5 marks]

15. The table below shows the characteristics of four organisms (P, Q, R, and S).

Feature	P	Q	R	S
Has backbone	Yes	No	Yes	No
Has jointed legs	No	Yes	No	Yes
Body covering	Fur	Exoskeleton	Feathers	Exoskeleton
Reproduces by	Live young	Eggs	Eggs	Eggs

(a) Identify one organism that is a mammal. Give a reason for your answer. [2]

Organism: _______________________________________________

Reason: ________________________________________________

(b) Identify one organism that is an insect. Explain your reasoning. [2]

Organism: _______________________________________________

Reason: ________________________________________________

[Total: 5 marks]

16. Read the following description of an unknown organism:

"The organism has a soft, unsegmented body protected by a hard shell. It moves slowly using a muscular foot. It lives on land and feeds on decaying plant matter."

(a) To which group of invertebrates does this organism most likely belong? [1]

(b) State two characteristics from the description that support your answer. [2]

(d) Explain why this organism is not classified as an arthropod. [1]

[Total: 5 marks]

Section C — Structured / Free-Response Questions (40 marks)

Questions 17–20: Answer all questions. Organise your answers clearly. Use scientific terms where appropriate. Show all reasoning.

17. A nature reserve has the following organisms living in it: grasshopper, earthworm, crab, frog, fish, eagle, fern, moss, rose bush, and mushroom.

(a) Classify the organisms into plants and animals. List them clearly. [3]

Plants:

Animals:

(b) Further classify the animals into vertebrates and invertebrates. [3]

Vertebrates:

Invertebrates:

(c) The mushroom is often mistaken for a plant. Explain two reasons why a mushroom is classified as a fungus and not a plant. [4]

[Total: 10 marks]

18. The diagram below shows a dichotomous key for classifying five organisms (A, B, C, D, and E).

1a. Organism has a backbone ........................ Go to 2
1b. Organism has no backbone ........................ Go to 4

2a. Organism has feathers ........................... A (Eagle)
2b. Organism does not have feathers ................. Go to 3

3a. Organism has moist skin ......................... B (Frog)
3b. Organism has dry scales ......................... C (Lizard)

4a. Organism has jointed legs ....................... D (Beetle)
4b. Organism does not have jointed legs ............. E (Jellyfish)

(a) Use the key to identify the following organisms. Write the letter (A–E) and the name.

(i) An organism with a backbone and dry scales. [1]

(ii) An organism with no backbone and no jointed legs. [1]

(b) For organism B (Frog), state two characteristics of amphibians that are not shown in the key. [2]

(c) A student claims that organism D (Beetle) should be grouped with organism C (Lizard) because both have legs. Explain why this is incorrect. [3]

(d) Construct a simple dichotomous key (using only two levels) to classify the following four organisms: shark, butterfly, earthworm, and sparrow. Use observable characteristics. [3]

1a. .................................................... ................
1b. .................................................... ................

2a. .................................................... ................
2b. .................................................... ................

3a. .................................................... ................
3b. .................................................... ................

[Total: 10 marks]

19. The bar chart below (described in text) shows the number of different species recorded in three habitats during a biodiversity survey.

Habitat	Number of Plant Species	Number of Animal Species	Total Species
Mangrove	12	34	46
Garden	28	18	46
Pond	8	22	30

(a) Which habitat has the greatest diversity of animal species? [1]

(b) The mangrove and garden have the same total number of species (46). Explain why this does not mean they have the same type of biodiversity. [3]

(c) A developer wants to convert the pond habitat into a car park. Predict two effects this would have on the diversity of organisms in the area. [2]

(d) Suggest two actions the school can take to increase the biodiversity of the garden habitat. [2]

(e) Explain why maintaining biodiversity is important for the stability of an ecosystem. [2]

[Total: 10 marks]

20. Read the following passage and answer the questions that follow.

Pitcher plants are unusual plants that grow in nutrient-poor soil, such as in tropical bogs. To obtain the nutrients they need, they have modified leaves that form a deep, liquid-filled cavity — the "pitcher." Insects are attracted to the pitcher by nectar and bright colours. When an insect lands on the slippery rim, it falls into the liquid and cannot escape. The plant then digests the insect to absorb nutrients.

Some pitcher plants even provide shelter for small organisms. Certain species of mosquitoes lay their eggs inside the pitcher liquid, and their larvae feed on the trapped insects without being digested by the plant.

(a) Classify the pitcher plant as a flowering or non-flowering plant. Give a reason for your answer. [2]

(b) Explain how the pitcher plant is adapted to obtain nutrients from insects. State two adaptations. [2]

(c) The pitcher plant carries out photosynthesis. State two things the pitcher plant needs from the environment to carry out photosynthesis. [2]

(d) A student says: "The pitcher plant is a carnivore because it eats insects." Explain why this statement is not scientifically accurate. [2]

(e) The mosquito larvae and the pitcher plant live together in the pitcher. The larvae get shelter and food, while the pitcher plant is neither helped nor harmed. What type of ecological relationship is this? [1]

(f) Give one other example of a plant that is adapted to obtain nutrients in an unusual way. [1]

[Total: 10 marks]

END OF PAPER

Check your work if you have time remaining.

Answers

TuitionGoWhere Practice Paper — Science Primary 6 PSLE

Answer Key — Diversity (Version 5 of 5)

Section A — Multiple Choice Questions (20 marks)

1. C [2]

Explanation: Living things are classified based on observable body features and structures (e.g., body covering, method of reproduction, presence of backbone). Colour, size, and number of legs alone are not reliable classification criteria because they can vary within a group.
Common mistake: Students may choose B (number of legs only), but this is insufficient — insects have 6 legs, spiders have 8, and crabs have 10, yet all are arthropods.

2. A (P) [2]

Explanation: Birds are characterised by having feathers. Only Organism P has feathers and does not have fur (which would indicate a mammal). Organism S has both feathers and fur, which is not a real combination — this is a distractor.
Common mistake: Choosing S because it has feathers, but no real organism has both feathers and fur.

3. B (Fern) [2]

Explanation: Ferns are non-flowering plants that reproduce by spores. Rose plants, mango trees, and sunflowers are all flowering plants that reproduce by seeds.
Common mistake: Students may confuse moss and fern — both reproduce by spores, but the question asks for a specific example and fern is the most commonly tested.

4. C (They breathe through lungs) [2]

Explanation: Bats (mammals), whales (mammals), penguins (birds), and crocodiles (reptiles) all breathe through lungs. Bats and penguins can fly (not whales or crocodiles — eliminate A). Only penguins have feathers (eliminate B). Only whales live entirely in water (eliminate D).
Common mistake: Choosing A because bats and penguins can fly, but whales and crocodiles cannot.

5. C [2]

Explanation: A fern is a plant that does not produce flowers or seeds. It reproduces by spores and is classified as a non-flowering plant → Fern. Fungi are a separate kingdom, not plants.
Common mistake: Choosing D (Moss) — moss is also a non-flowering spore-producing plant, but the question specifically asks about the classification of a fern.

6. A [2]

Explanation: Monocots have parallel leaf veins and one cotyledon; dicots have network-like (reticulate) leaf veins and two cotyledons. Option B is reversed. Option C is reversed. Option D is incorrect because both monocots and dicots are flowering plants.
Common mistake: Students often reverse the monocot/dicot features.

7. B (Mushroom) [2]

Explanation: Mushrooms are fungi. They do not have chlorophyll and cannot make their own food. Algae are simple plant-like organisms; ferns and mosses are plants.
Common mistake: Students may choose A (Algae) thinking it is a fungus because it is simple, but algae can photosynthesise and are classified as plant-like protists.

8. B (Molluscs) [2]

Explanation: Molluscs (e.g., snails, slugs, clams) are characterised by a soft body, often with a hard shell, and movement via a muscular foot. Insects have jointed legs and exoskeletons. Fish have fins and scales. Amphibians have moist skin.
Common mistake: Students may choose A (Insects) if they focus on "hard shell" without noting the muscular foot.

9. C (They feed their young with milk) [2]

Explanation: All mammals have mammary glands and feed their young with milk. Not all mammals lay eggs (only monotremes like platypus — eliminate A). Scales are found on reptiles and fish (eliminate B). Some mammals live in water, e.g., whales (eliminate D).
Common mistake: Choosing D — students may not know that whales and dolphins are mammals.

10. C (Invertebrate — Arthropod) [2]

Explanation: A butterfly has no backbone (invertebrate) and has jointed legs (arthropod). Following the key: 1b (no backbone) → 4a (has jointed legs) → Arthropod.
Common mistake: Choosing D if the student forgets that insects have jointed legs.

Section B — Short-Answer Questions (40 marks)

11. [5 marks]

(a) [3] — Accept any valid observable characteristic from the table. Full example:

Characteristic used: Body covering

Group 1 (Scales): Shark, Crocodile Group 2 (Not scales / Feathers, Fur, Moist skin): Eagle, Frog, Bat

Alternative acceptable answers:

Characteristic: Reproduces by → Group 1 (Live young): Shark, Bat; Group 2 (Eggs): Eagle, Frog, Crocodile
Characteristic: Habitat → Group 1 (Water): Shark; Group 2 (Not water-only / Air/Land, Water/Land): Eagle, Frog, Crocodile, Bat

Marking: 1 mark for valid characteristic, 1 mark for each correctly listed group.

(b) [2]

Reason 1: Bats have fur/hair on their bodies, whereas birds have feathers.
Reason 2: Bats give birth to live young and feed them with milk, whereas birds lay eggs.

Marking: 1 mark per valid reason. Accept equivalent phrasing.

12. [5 marks]

(a) [1] Moss and fern

(b) [2] Ferns reproduce by spores. The spores are produced in spore cases (sori) found on the undersides of their fronds/leaves. When the spores are released and land in a suitable moist environment, they grow into new fern plants.

Marking: 1 mark for "spores", 1 mark for describing where spores are found or how they develop.

Feature: Rose plants have network-like (reticulate) leaf veins / two cotyledons in the seed / a tap root system / flower parts in multiples of 4 or 5.

Marking: 1 mark for identifying rose plant, 1 mark for a valid feature. (Pine trees are gymnosperms/non-flowering, so they are neither monocots nor dicots in the traditional sense.)

13. [5 marks]

(a) [1] Leaves W and Y (both have parallel veins and 1 cotyledon).

(b) [2] Any two of the following:

Root system — Monocots have fibrous roots; dicots have tap roots.
Flower parts — Monocots have flower parts in multiples of 3; dicots in multiples of 4 or 5.
Vascular bundle arrangement — Monocots have scattered vascular bundles; dicots have vascular bundles arranged in a ring.
Secondary growth — Monocots generally do not have secondary growth (no wood); dicots can have secondary growth.

Marking: 1 mark per valid feature.

Monocot: Grass / maize / rice / wheat / lily / orchid / palm / onion (any valid example)
Dicot: Rose / mango / sunflower / bean / pea / hibiscus / balsam (any valid example)

Marking: 1 mark per valid example.

14. [5 marks]

(a) [2] Any two of the following:

They all have a backbone (vertebral column).
They all have an internal skeleton (endoskeleton).
They all have a well-developed brain protected by a skull.
They all have a closed circulatory system.

Marking: 1 mark per valid feature.

(b) [1] Arachnids

(c) [2] A penguin is classified as a bird because it has feathers, lays eggs, and has a beak — all of which are key characteristics of birds. The ability to fly is not a defining characteristic of birds (e.g., ostriches and emus also cannot fly but are birds).

Marking: 1 mark for stating key bird features (feathers/eggs/beak), 1 mark for explaining that flight is not a defining characteristic.

15. [5 marks]

(a) [2]

Organism: P
Reason: Organism P has fur as its body covering and gives birth to live young, which are characteristics of mammals.

Marking: 1 mark for correct organism, 1 mark for valid reason.

(b) [2]

Organism: Q or S (both are invertebrates with jointed legs and exoskeletons; either is acceptable if reasoning is correct)
Reason: Organism Q/S has no backbone, has jointed legs, and has an exoskeleton, which are characteristics of arthropods/insects.

Note: If the student chooses Q or S and gives valid reasoning, award full marks. If the student specifies "insect" and the organism has 6 legs (implied by context), accept. Spiders (8 legs) are arachnids, not insects, but at P6 level, grouping under arthropod is acceptable.

Marking: 1 mark for correct organism, 1 mark for valid reasoning.

(c) [1] Any one of: has a beak / lays eggs / has wings / has hollow bones / has a keel on the sternum (any valid bird feature not in the table).

16. [5 marks]

(a) [1] Molluscs

(b) [2]

It has a soft, unsegmented body.
It has a hard shell and moves using a muscular foot.

Marking: 1 mark per valid characteristic from the description.

(d) [1] This organism is not an arthropod because it does not have jointed legs or an exoskeleton. Arthropods (e.g., insects, spiders, crabs) have jointed appendages and a segmented body, which this organism lacks.

Marking: Award 1 mark for any valid distinguishing feature.

Section C — Structured / Free-Response Questions (40 marks)

17. [10 marks]

(a) [3]

Plants: Fern, Moss, Rose bush, Mushroom (Note: Mushroom is a fungus, but if the student lists it under plants, deduct 1 mark and note the error. Accept the answer as "Fern, Moss, Rose bush" for 2 marks if mushroom is excluded.)

Full credit answer:

Plants: Fern, Moss, Rose bush
Fungi: Mushroom
Animals: Grasshopper, Earthworm, Crab, Frog, Fish, Eagle

Marking: 1 mark for correctly listing all three plants, 1 mark for correctly listing all six animals, 1 mark for correctly identifying mushroom as a fungus (or not including it under plants).

If student lists mushroom under plants: award 2/3 (deduct 1 mark).

(b) [3]

Vertebrates: Frog, Fish, Eagle Invertebrates: Grasshopper, Earthworm, Crab

Marking: 1 mark for each correctly classified vertebrate group (frog, fish, eagle = 3 organisms, 1 mark for all correct), 1 mark for each correctly classified invertebrate group (grasshopper, earthworm, crab = 3 organisms, 1 mark for all correct), 1 mark for overall accuracy.

Alternative marking: 1 mark for vertebrates list (all 3 correct), 1 mark for invertebrates list (all 3 correct), 1 mark for no errors.

Reason 1: Mushrooms do not have chlorophyll and cannot carry out photosynthesis to make their own food. Plants have chlorophyll and can photosynthesise.
Reason 2: Mushrooms do not have roots, stems, or leaves, which are structures found in plants. Instead, they have a network of thread-like structures called hyphae.
(Accept also: Mushrooms reproduce by spores but do not have the complex structures of plants; mushrooms obtain nutrients by decomposing dead organic matter, whereas plants make their own food.)

Marking: 2 marks per valid reason. Award 1 mark if the reason is partially correct or lacks clarity.

18. [10 marks]

(a) [2] (i) C (Lizard) — has a backbone (Go to 2), does not have feathers (Go to 3), has dry scales → C. (ii) E (Jellyfish) — no backbone (Go to 4), no jointed legs → E.

Marking: 1 mark each for correct letter and name.

(b) [2] Any two of the following:

Amphibians have moist, permeable skin that can absorb water and oxygen.
Amphibians undergo metamorphosis (e.g., tadpole → frog).
Amphibians lay their eggs in water or moist environments.
Amphibians are ectothermic (cold-blooded) — their body temperature changes with the environment.
Young amphibians (tadpoles) breathe through gills; adults breathe through lungs and skin.

Marking: 1 mark per valid characteristic.

(c) [3] The student's claim is incorrect because classification is based on multiple shared characteristics, not just one feature. While both the beetle and lizard have legs, they differ in fundamental ways:

The beetle is an invertebrate (no backbone) with an exoskeleton and jointed legs, placing it in the arthropod group.
The lizard is a vertebrate (has a backbone) with dry scales and lungs, placing it in the reptile group.
Grouping organisms requires considering body covering, presence of backbone, method of reproduction, and other structural features, not just the presence of legs.

Marking: 1 mark for stating that classification requires multiple characteristics, 1 mark for identifying key differences (backbone vs. no backbone), 1 mark for clear explanation of why the grouping is wrong.

(d) [3] Accept any valid dichotomous key. Example:

1a. Organism has a backbone ........................ Go to 2
1b. Organism has no backbone ........................ Go to 3

2a. Organism has feathers ........................... Sparrow
2b. Organism has scales and fins .................... Shark

3a. Organism has jointed legs ....................... Butterfly
3b. Organism does not have jointed legs ............. Earthworm

Marking: 1 mark for correct first-level split (backbone vs. no backbone), 1 mark for correct second-level splits within each branch, 1 mark for all four organisms correctly identified at the end of the key.

Alternative valid keys are acceptable (e.g., starting with habitat, body covering, etc.) as long as they correctly classify all four organisms.

19. [10 marks]

(a) [1] Mangrove (34 animal species, the highest among the three habitats).

(b) [3] Although both habitats have the same total number of species (46), the composition of species is different:

The mangrove has more animal species (34) but fewer plant species (12).
The garden has more plant species (28) but fewer animal species (18).
This means the types of organisms and the balance between plants and animals differ between the two habitats. Biodiversity includes not just the total number of species but also the variety of different types of organisms present.
The mangrove and garden support different communities of organisms adapted to different environmental conditions.

Marking: 1 mark for identifying the difference in composition, 1 mark for explaining that biodiversity includes variety of types (not just total number), 1 mark for clear comparison.

The habitat would be destroyed, leading to the loss of all organisms (plants and animals) that depend on the pond for survival.
The number of species in the area would decrease, reducing biodiversity. Organisms such as fish, frogs, and aquatic plants would lose their home and may die or migrate.

Marking: 1 mark per valid effect. Accept equivalent answers (e.g., "organisms would lose their habitat," "food chains would be disrupted," "water plants would die").

(d) [2] Any two of the following:

Plant a variety of flowering plants to attract more insects (e.g., butterflies, bees) and birds.
Create a small pond or water feature to attract aquatic organisms and amphibians.
Avoid using pesticides that could harm insects and other small organisms.
Add compost or mulch to encourage decomposers (e.g., earthworms, fungi) to thrive.
Plant native species that are well-adapted to the local environment and support local wildlife.

Marking: 1 mark per valid suggestion.

(e) [2] Maintaining biodiversity is important because:

A greater variety of species means a more stable ecosystem. If one species is affected (e.g., by disease), other species can fill its role, and the ecosystem continues to function.
Different species are interconnected through food chains and food webs. The loss of one species can affect many others that depend on it for food or other ecological roles.
Biodiversity ensures that nutrient cycles and energy flow continue efficiently, supporting the survival of all organisms in the ecosystem.

Marking: 1 mark for mentioning stability/resilience, 1 mark for explaining interconnectedness (food chains/webs or nutrient cycles).

20. [10 marks]

(a) [2] The pitcher plant is a flowering plant. It produces flowers for reproduction (even though the passage focuses on its modified leaves, pitcher plants do produce flowers). It also carries out photosynthesis, which is a characteristic of plants.

Marking: 1 mark for identifying it as a flowering plant, 1 mark for a valid reason (produces flowers / photosynthesises / has chlorophyll / has roots, stems, and leaves).

Note: Some students may argue "non-flowering" if they focus only on the passage. Award 1 mark for the identification and 1 mark for any reasonable justification. The scientifically correct answer is that pitcher plants ARE flowering plants (they belong to the order Ericales or Nepenthales depending on classification).

(b) [2]

The pitcher plant has modified leaves that form a deep, liquid-filled cavity (the pitcher) to trap insects.
The rim of the pitcher is slippery, causing insects to fall in and be unable to escape.
The plant produces nectar and bright colours to attract insects to the pitcher.
The liquid inside the pitcher contains digestive enzymes that break down the insect's body so the plant can absorb the nutrients.

Marking: 1 mark per valid adaptation (any two).

Sunlight (light energy)
Carbon dioxide (from the air)
Water (from the soil)
Chlorophyll (in the leaves — accept as it is needed for the process)

Marking: 1 mark per valid requirement (any two from the above).

(d) [2] The statement is not accurate because:

The pitcher plant is not a carnivore in the way animals are. It is a plant that carries out photosynthesis to make its own food (glucose).
It only absorbs nutrients from insects to supplement the nutrients it cannot obtain from the poor soil — it still produces its own food through photosynthesis.
A true carnivore is an animal that eats other animals as its primary source of energy and nutrition. The pitcher plant's primary energy source is sunlight, not insects.

Marking: 1 mark for explaining that the plant still photosynthesises, 1 mark for distinguishing between supplementing nutrients vs. being a true carnivore.

(e) [1] Commensalism — one organism benefits (mosquito larvae get shelter and food) while the other is neither helped nor harmed (pitcher plant).

(f) Venus flytrap / sundew / bladderwort / cobra lily (any valid example of a carnivorous or unusual nutrient-obtaining plant).

Marking: 1 mark for any valid example.

END OF ANSWER KEY

Mark Summary:

Section	Marks
A (Q1–10)	20
B (Q11–16)	30
C (Q17–20)	50
Total	100

Note: Section B totals 30 marks and Section C totals 50 marks, giving a grand total of 100 marks. Individual question marks are indicated in brackets throughout.