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Primary 6 PSLE Science Semestral Assessment 2 (End of Year) Paper 2
Free P6 PSLE Science SA2 Paper 2, LongCat Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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TuitionGoWhere Practice Paper - Science Primary 6 PSLE
SA2 — Version 2 of 5 — Answer Key
Section A: Multiple-Choice Questions [20 marks]
| Q | Answer | Marks | Notes |
|---|---|---|---|
| 1 | B | 1 | White fur provides camouflage in the Arctic snow, helping the polar bear hunt prey. |
| 2 | D | 1 | Both cactus and camel have adaptations for hot, dry desert environments. |
| 3 | B | 1 | Algae, fern, and moss are all plants; mushroom and yeast are fungi. |
| 4 | D | 1 | Frog and salamanders have moist skin; eagle and bat have feathers/fur and dry skin. |
| 5 | A | 1 | Not all living things can move (e.g., plants). |
| 6 | C | 1 | Energy flows from the producer (grass) through the food chain to the snake. |
| 7 | C | 1 | Dolphin is a mammal; penguin is a bird; crocodile and lizards are reptiles. |
| 8 | C | 1 | Feathers, beak, wings, and egg-laying are characteristics of birds. |
| 9 | A | 1 | Fish and frog are vertebrates; spider and crab are invertebrates. |
| 10 | C | 1 | Fern is a non-flowering plant; rose, orchid, and sunflower are flowering plants. |
| 11 | B | 1 | Mushroom is a fungus; algae, fern, and moss are plants. |
| 12 | A | 1 | With fewer snakes, the hawk will prey more on mice, so the number of mice will decrease. |
| 13 | B | 1 | Gills allow fish to breathe underwater. |
| 14 | B | 1 | Grass is a producer; the others are consumers. |
| 15 | C | 1 | The pitcher plant digests insects to obtain nutrients (nitrogen) from them. |
| 16 | A | 1 | Ant, spider, and earthworm are all invertebrates. |
| 17 | C | 1 | Fox is a secondary consumer; grass is a producer; rabbit is a primary consumer; mushroom is a decomposer. |
| 18 | B | 1 | All birds have feathers; not all birds can fly (e.g., penguin). |
| 19 | D | 1 | Bacteria, yeast, and mushroom are all fungi — they do not make their own food (heterotrophs). |
| 20 | A | 1 | A food chain starts with a producer and flows in the correct direction of energy transfer. |
Section B: Structured Questions [25 marks]
21. [3 marks]
(a) Organism Q [1 mark]. It has feathers, which is a characteristic unique to birds [1 mark].
(b) Organism R [1 mark]. It has no backbone, which is a characteristic of insects/invertebrates.
22. [3 marks]
(a) Grass [1 mark].
(b) Sparrow and Frog [1 mark each]. (Accept any two secondary consumers from the food web.)
23. [3 marks]
(a) [2 marks]
| Mammals | Non-mammals |
|---|---|
| Bat, Whale | Shark, Crocodile |
[1 mark for each correct column.]
(b) Mammals give birth to live young (or mammals have mammary glands / mammals have hair or fur) [1 mark].
24. [4 marks]
(a) Needle-like leaves reduce the surface area [1 mark], which helps to reduce water loss (transpiration) in a cold, dry environment [1 mark].
(b) Broad, flat leaves have a large surface area [1 mark], which helps the plant absorb more sunlight for photosynthesis in a wet environment [1 mark].
25. [3 marks]
(a) The garden has greater diversity [1 mark]. It has more different types of organisms (ant, grasshopper, dragonfly) compared to the pond (only dragonfly, water lily, fish) [1 mark].
(b) Fish need water to survive [1 mark]. The garden does not have a body of water for fish to live in.
26. [3 marks]
(a) The number of birds will decrease [1 mark]. The birds feed on caterpillars, so with fewer caterpillars, there is less food available for the birds [1 mark].
(b) The number of wild cats will decrease [1 mark]. With fewer birds, there is less food for the wild cats.
27. [3 marks]
(a) They can fly (or they have feathers / they have wings) [1 mark].
(b) They have a backbone (or they are vertebrates) [1 mark].
(c) They do not have a backbone (or they are invertebrates) [1 mark].
28. [3 marks]
(a) Humps store fat for energy in the desert where food is scarce [1 mark].
(b) Long eyelashes protect eyes from sand [1 mark].
(c) Wide, flat feet prevent sinking into the sand [1 mark].
(Accept other valid adaptations: ability to go without water for long periods, thick fur on top to protect from sun, etc.)
Section C: Free-Response Questions [15 marks]
29. [4 marks]
(a) Grass [1 mark].
(b) Grasshopper and Rabbit [1 mark each].
(c) Hawk [1 mark]. The hawk is both a secondary consumer (when it eats the lizard) and a tertiary consumer (when it eats the snake).
30. [4 marks]
(a) [2 marks]
| Plants | Animals |
|---|---|
| Mangrove tree, Algae | Mud crab, Monitor lizard, Egret, Mudskipper fish |
[1 mark for each correct column.]
(b) [2 marks]
| Vertebrates | Invertebrates |
|---|---|
| Monitor lizard, Egret, Mudskipper fish | Mud crab |
[1 mark for each correct column.]
31. [4 marks]
Adaptation 1: The cactus has a thick, waxy outer covering [1 mark], which helps to reduce water loss (transpiration) in the hot desert [1 mark].
Adaptation 2: The cactus has spines instead of leaves [1 mark], which helps to reduce water loss and protect the plant from being eaten by animals [1 mark].
(Accept other valid adaptations: shallow but widespread roots to absorb water quickly, thick stem to store water, etc.)
32. [3 marks]
(a) The Sun [1 mark].
(b) The number of small fish will increase [1 mark]. With fewer large fish, there is less predation on the small fish, so their population will grow [1 mark].
End of Answer Key