Coordination is how an organism detects a change and responds to it. In IGCSE Biology 0610 it covers nervous and hormonal communication, plant responses and the eye as a sense organ. Check the current syllabus on the Cambridge subject page for exact wording.
What should you know before you start?
You should know what a cell is, what diffusion means and that the blood carries substances around the body. The movement across membranes topic helps with diffusion, and the circulation and blood topic helps with hormones in the blood.
An orienting example
This short scenario uses the whole topic. It is invented for practice.
A runner hears a shout, flinches, and her heart keeps racing for a while afterwards.
- The flinch is fast and automatic. It follows the pathway in tracing a reflex, with a synapse between neurones as in the role of a synapse.
- The racing heart that lasts longer is the work of a hormone, adrenaline, carried in the blood, as in nervous and hormonal signalling.
The two responses differ in speed and in how long they last, and that contrast is what many exam questions test.
In which order should you study the lessons?
- Trace a reflex pathway: it gives the basic sequence of parts.
- Explain the role of a synapse: it zooms in on how a signal crosses between neurones.
- Compare nervous and hormonal signalling: it puts the two systems side by side.
- Interpret a simple tropism investigation: it moves to plants and to reading data.
- Connect a sensory structure with its function: it links the eye’s structure to what it does.
Then try the mixed practice set. The next topic, drugs and biological effects, builds on synapses.
What are the common traps?
- Putting the brain inside a reflex. The spinal cord coordinates the reflex.
- Reversing sensory and motor. Sensory goes to the CNS and motor comes from it.
- Letting the impulse “jump” a synapse. A chemical crosses the gap.
- Listing instead of comparing. Use “whereas” and match the same feature.
- Claiming too much from data. Say what the results suggest.
- Swapping eye parts. The lens focuses and the retina detects.
How should you use the practice set?
Answer with the solutions covered, in full sentences. Then compare your wording with the worked answers, not only the final word. The routing table at the end sends each error back to a single lesson.
If reflex pathways or nervous versus hormonal comparisons keep losing you marks, a teacher in online one-to-one Biology tuition can go through your answers with you. It starts with a paid one-hour trial.