Characteristics
Comprehensive notes, formulas, and practice questions for Characteristics.
Characteristics
Characteristics of Living Things
What you'll learn
- The defining characteristics of living organisms — nutrition, respiration, growth, reproduction, response, excretion, movement.
- Why one trait alone (e.g. movement) does not prove something is alive.
- How to design a simple test (e.g. seed vs stone) to distinguish living from non-living.
- The borderline case of viruses (need a host to reproduce).
Key concepts
Level 1 — The living checklist
Verbal: Living things carry out life processes using cells; non-living things do not.
| Characteristic | Living example | Non-living counter-example |
|---|---|---|
| Nutrition | Plant makes food; animal eats | Car needs fuel but has no cells |
| Respiration | Release energy from food | Fire burns but is not alive |
| Growth | Seed → seedling | Cloud changes shape |
| Response | Touch-me-not closes leaves | Door opens on push (mechanical) |
| Reproduction | Bean plant produces seeds | Robot copies (programmed, not biological) |
Level 2 — Applying the test
Rule: Something is living if it shows most/all characteristics together over time — not just one.
Visual (text): Wet cotton + bean seeds → sprout in 5 days; pebbles unchanged → growth + nutrition = living.
Worked example
Is a car alive because it moves?
Step 1 — List car traits: moves ✓, needs fuel (not true nutrition) ✗, no growth ✗, no reproduction ✗
Step 2 — Compare to bean seed: grows, respires, reproduces ✓
Step 3 — Conclude: movement alone ≠ living; car is non-living
Common mistakes
| Mistake | Why it happens | Fix |
|---|---|---|
| "Car moves → alive" | Single-trait thinking | Need multiple life processes |
| "Plants don't move" | Only see whole-plant motion | Parts move (sunflower, roots) |
| "Fire eats fuel → alive" | Superficial analogy | Fire has no cells or controlled growth |
| "Clouds grow → alive" | Shape change looks like growth | No cells, no nutrition |
Quick check
- List five characteristics of living things.
- Why is a stone non-living even if you roll it?
- Give one plant example of response to stimuli.
Open the Practice tab for graded questions on Characteristics of Living Things.
Key Takeaways (TL;DR)
- What you'll learn
- Key concepts
- Worked example
- Common mistakes
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