The Systems Idea | Parts Matter Because Relationships Matter

Students can memorise “root absorbs water”, “heart pumps blood” and “switch opens the circuit” yet still fail unfamiliar questions. Systems questions change the surface. They ask what happens if a root cannot absorb water, if a pathway is blocked, if a circuit is incomplete, or if one part is removed.

The stronger learner tracks what enters, where it moves, which part changes it or carries it, and what outcome depends on that flow. This is the systems habit that transfers across Biology, electricity and later Science.

Top 100 Systems Keywords | Core First, Enrichment Later

Terms 1–60 form the Primary Science core/bridge vocabulary. Terms 61–100 preserve useful wider-system vocabulary from the 2024 page for enrichment and later study.

1–20 | System Language and Plant Systems

1. System — a set of connected parts working together to perform one or more functions.
2. Part — one component of a larger system.
3. Function — the job performed by a part or system.
4. Interaction — effect one part has on another.
5. Input — material, energy or information entering a system.
6. Output — material, energy or information leaving a system.
7. Flow — movement through a system.
8. Process — connected sequence of actions or changes.
9. Structure — arrangement or form of a part that relates to its function.
10. Organ — body structure made of tissues that performs particular functions.
11. Root — plant part that anchors the plant and absorbs water and mineral salts.
12. Root hair — tiny extension that increases surface area for absorption.
13. Stem — plant part that supports leaves and contains transport pathways.
14. Leaf — plant part that receives light and is a major site of photosynthesis.
15. Flower — reproductive structure of a flowering plant.
16. Plant system — connected plant parts whose functions support survival and reproduction.
17. Transport system — pathways that move substances from one part to another.
18. Water-carrying tube — plant transport pathway moving water from roots to other parts.
19. Food-carrying tube — plant transport pathway moving food from leaves to other parts.
20. Photosynthesis — process in which green plants use light energy to make food.

21–40 | Human Digestive, Respiratory and Circulatory Systems

21. Digestive system — system that breaks food down and allows useful substances to be absorbed.
22. Mouth — entry point where food is taken in and mechanical digestion begins.
23. Oesophagus — tube carrying food from mouth to stomach.
24. Stomach — organ where food is mixed and further digested.
25. Small intestine — organ where much digestion and absorption occur.
26. Large intestine — organ involved in absorbing water and forming waste for removal.
27. Digestion — breakdown of food into simpler substances that can be absorbed.
28. Absorption — movement of digested substances into the body’s transport system.
29. Respiratory system — organ system involved in gas exchange.
30. Nose — passage through which air can enter the respiratory system.
31. Trachea — airway conducting air towards the lungs.
32. Lungs — organs where gas exchange occurs.
33. Gas exchange — movement of gases between the body and its surroundings.
34. Oxygen — gas needed by body cells for respiration.
35. Carbon dioxide — gas produced in respiration and removed from the body.
36. Circulatory system — transport system moving blood and carried substances around the body.
37. Heart — organ that pumps blood.
38. Blood — fluid transporting substances around the body.
39. Blood vessel — tube through which blood flows.
40. Transport — movement of substances from one place to another.

41–60 | Electrical Systems and Transfer Language

41. Electrical system — connected components that allow electrical energy to be transferred and used.
42. Electric circuit — complete path through which electric current can flow.
43. Electric cell — source of electrical energy in a simple circuit.
44. Battery — one or more cells used as an electrical energy source.
45. Bulb — component that converts electrical energy mainly into light and heat.
46. Switch — component that opens or closes a circuit.
47. Wire — conducting path connecting circuit components.
48. Conductor — material that allows electric current to pass through readily.
49. Insulator — material that resists the flow of electric current.
50. Closed circuit — complete conducting path that allows current to flow.
51. Open circuit — broken or incomplete path preventing current flow.
52. Series circuit — circuit in which components are connected along one main path.
53. Cell — basic structural unit of living things; context distinguishes it from an electric cell.
54. Organism — individual living thing made of one or more cells.
55. Organ system — group of organs working together.
56. Relationship — way in which parts or quantities are connected.
57. Dependence — condition in which one part relies on another.
58. Connection — link allowing parts of a system to interact.
59. Pathway — route along which a material, energy or signal moves.
60. Network — connected set of multiple pathways or parts.

61–80 | Wider Natural and Human-System Enrichment

61. Ecosystem — organisms and their physical environment considered as an interacting system.
62. Food chain — sequence of feeding relationships.
63. Food web — network of interconnected food chains.
64. Nervous system — body communication and control system; later-study enrichment.
65. Excretory system — system removing metabolic waste; enrichment beyond the Primary core.
66. Biome — large ecological region defined by climate and typical life.
67. Carbon cycle — movement of carbon among organisms and the environment.
68. Water cycle — continuous movement and change of water.
69. Nitrogen cycle — movement and conversion of nitrogen compounds through ecosystems.
70. Trophic level — feeding position in a food chain or web.
71. Biodiversity — variety of living organisms.
72. Decomposition — breakdown of dead organic matter.
73. Habitat — place where an organism lives.
74. Population — organisms of one species living in an area.
75. Symbiosis — close ecological relationship between different species.
76. Solar power — use of sunlight to produce useful energy.
77. Hydraulic system — system using pressurised fluid to transmit force.
78. Mechanical system — connected mechanical parts transmitting forces or motion.
79. Power grid — network delivering electrical power.
80. Internet — global digital communication network; systems-thinking enrichment.

81–100 | Engineering, Plant and Feedback-System Enrichment

81. Pump — device that moves fluids.
82. Generator — device converting mechanical energy into electrical energy.
83. Robotics — field involving programmable machines and control systems.
84. Water filtration system — connected processes used to remove impurities from water.
85. Heating system — system supplying heat to a space or process.
86. Cooling system — system removing heat to lower temperature.
87. Traffic control system — network coordinating movement of vehicles or pedestrians.
88. Telecommunication system — system transmitting information over distance.
89. Waste management system — system for collecting, processing and handling waste.
90. Air-conditioning system — system controlling temperature and often humidity of indoor air.
91. Automation system — control system operating processes with reduced direct human intervention.
92. Manufacturing system — connected processes used to produce goods.
93. Xylem — plant vascular tissue transporting water and mineral salts; later terminology bridge.
94. Phloem — plant vascular tissue transporting sugars and other organic substances.
95. Stomata — pores in leaves involved in gas exchange and water loss.
96. Chloroplast — plant-cell organelle where photosynthesis occurs.
97. Vascular tissue — plant tissues specialised for transport.
98. Meristem — region of active plant growth; enrichment.
99. Sensory system — structures involved in detecting stimuli; enrichment.
100. Feedback system — system in which outputs influence later system behaviour.

Common Systems Failure Modes

• Part-listing: names are memorised without functions or relationships.
• Function without flow: the student knows what a part does but not what enters, leaves or moves through it.
• Single-system isolation: respiratory and circulatory systems are memorised separately even when the question depends on their relationship.
• Electrical component confusion: cell, battery, bulb, switch and wire are recognised but the learner cannot trace the complete conducting path.
• Advanced vocabulary substitution: terms such as xylem or cardiovascular system are used when simpler syllabus language would be clearer and safer.

How to Learn Systems Vocabulary

1. Draw the parts. Keep the diagram simple enough to reason with.
2. Label the function. Every important part must have a job.
3. Add arrows. Show what moves and in which direction.
4. State the connection. Explain why one part depends on another.
5. Break one link. Predict the consequences.
6. Transfer. Apply the same systems questions to a plant, a human body and a circuit.

Where the Other Theme Vocabulary Goes

• Diversity — classification and material properties.
• Cycles — life cycles, matter and water.
• Energy — light, heat, photosynthesis and conversion.
• Interactions — magnets, forces and environment.

Science Estate Handoff

Stay here for Systems vocabulary and reasoning. Use How Primary Science Changes from P3 to P6 for the developmental subject map, and Science Tuition at eduKatePunggol for current tuition/service intent.

A system is understood when the student can trace what happens through the connections.