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Primary 6 PSLE Science Semestral Assessment 1 (Mid-Year) Paper 2
Free P6 PSLE Science SA1 Paper 2, Qwen3.7 Exam version, with questions, answers, and PSLE-focused practice for Singapore students.
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TuitionGoWhere Practice Paper - Science Primary 6 PSLE (SA1 Version 2)
Answer Key and Marking Scheme
Section A (28 marks)
| Qn | Answer | Remarks |
|---|---|---|
| 1 | 2 | Frogs, snakes, and eagles are all oviparous (lay eggs). |
| 2 | 3 | Plant R follows the path: No spores -> Has flowers -> Seeds in fruits. This describes a flowering plant. |
| 3 | 3 | Mammals are characterized by hair/fur and mammary glands (milk). |
| 4 | 3 | If frogs decrease, snakes have less food from frogs, so they may eat more mice. Increased predation on mice causes their population to decrease. |
| 5 | 2 | Thick, waxy skin (cuticle) reduces water loss through transpiration. |
| 6 | 2 | X: Moss (spores, no vascular). Y: Flowering Plant (seeds, vascular). Z: Mushroom (fungi, spores, no chlorophyll). |
| 7 | 1 | Fungi are heterotrophs (saprophytes/parasites), unlike plants which are autotrophs. |
| 8 | 1 | Snakes and lizards are both reptiles with scales. |
| 9 | 2 | Earthworms are invertebrates (no backbone). |
| 10 | 2 | High biodiversity increases ecosystem stability. |
| 11 | 2 | Insects have 6 legs, 3 body parts, and an exoskeleton. |
| 12 | 4 | Increasing pests is harmful, not a reason for conservation. |
| 13 | 2 | The larva (caterpillar) stage is the main feeding stage to store energy. |
| 14 | 2 | Ferns are non-flowering vascular plants that reproduce by spores. |
| 15 | 2 | Pneumatophores allow gas exchange in oxygen-poor muddy soil. |
| 16 | 2 | Kingdom -> Phylum -> Class -> Order is the correct hierarchy. |
| 17 | 2 | Interdependence describes mutual reliance. |
| 18 | 2 | White fur provides camouflage in snowy environments. |
| 19 | 2 | Viruses lack cellular structure and cannot reproduce independently. |
| 20 | 3 | Overfishing directly reduces species populations and disrupts food webs. |
Section B (28 marks)
21.
(a) Both produce seeds. [1]
Note: Accept "Both are seed-producing plants". Do not accept "Both have roots" as the question asks about reproduction.
(b) Plant A's seeds are enclosed in a fruit, while Plant B's seeds are naked (in cones) and not enclosed in a fruit. [1]
Note: Must mention "enclosed in fruit" vs "naked/not in fruit".
(c) Needle-like leaves have a smaller surface area, which reduces water loss through transpiration. This helps the plant conserve water in cold/dry conditions where water may be frozen. [2]
Marking: 1 mark for smaller surface area/reduces transpiration. 1 mark for conserving water.
22. (a) Leaf (or Plant). [1]
(b) The population of spiders will decrease. [1] Because the ladybirds will die due to lack of food (aphids), leading to a lack of food for the spiders. [1]
Marking: 1 mark for correct trend (decrease). 1 mark for correct reasoning (link through food chain).
(c) A food web shows multiple feeding relationships and how organisms are interconnected, whereas a food chain shows only a single linear path. [1]
Note: Accept "shows more complex relationships" or "shows what happens if one food source is removed".
23. (a) Reptile. [1]
(b) Amphibians have moist skin that allows for gas exchange, which requires moisture. [1] Also, they lay jelly-like eggs without shells that would dry out on land, so they need water for reproduction. [1]
Marking: 1 mark for skin/respiration. 1 mark for reproduction/eggs.
(c) Streamlined body shape OR Fins OR Tail for propulsion. [1]
24. (a) Light intensity. [1]
(b) Plant Y. [1] Because Plant Y grows taller at low to medium light intensity compared to Plant X, or Plant Y's growth decreases at high light intensity suggesting it prefers shade. [1]
Note: Looking at the graph data provided in placeholder: Plant Y is 8cm at Low, Plant X is 5cm. Plant Y is taller at low light.
(c) Amount of water OR Type of soil OR Temperature OR Size of pot. [1]
Note: Must be a relevant variable. "Time" is not accepted as it is the duration of the experiment.
25.
(a) Iron (or Steel/Nickel/Cobalt). [1]
Note: Must be a magnetic material.
(b) Transparency (allows light to pass through). [1]
(c) Elasticity (or Stretchy). [1]
26.
(a) Deforestation removes trees which are the homes/shelter for many animals. [1] Without shelter and food sources, animals cannot survive or reproduce, leading to population decline or extinction. [1]
Marking: 1 mark for removal of home/food. 1 mark for consequence (death/migration).
(b) Replanting trees (reforestation) OR Creating nature reserves OR Enforcing laws against illegal logging. [1]
27. (a) Photosynthesis. [1]
(b) Respiration. [1]
(c) Process Y (Respiration/Combustion) releases carbon dioxide into the atmosphere. [1] Carbon dioxide is a greenhouse gas that traps heat, causing the Earth's temperature to rise. [1]
Marking: 1 mark for CO2 release. 1 mark for trapping heat/global warming mechanism.
28. (a) Earthworm. [1]
(b) It aerates the soil (makes holes for air/water) OR It decomposes dead organic matter to enrich the soil with nutrients. [1]
(c) To understand the relationships between organisms OR To identify organisms correctly for conservation/study. [1]
Note: Accept any valid reason related to scientific organization or conservation.