How does a reflex arc protect the body?
Answer framework: Trace the impulse pathway and explain why spinal processing makes the response rapid.
All Class 10 Science notes
Chapter 6 • Biology
Control and Coordination
Explain how nervous and hormonal systems coordinate responses in animals and how plants respond through movements and hormones.
Core concepts checklist
Neuron, nerve impulse and reflex action
Human brain and nervous system
Coordination through animal hormones
Tropic and nastic movements
Plant hormones and growth responses
Formula & fact bank
Stimulus → receptor → sensory neuron → CNS → motor neuron → effector
Auxin: cell elongation
Gibberellin: stem growth
ABA: growth inhibition and stomatal closure
Diagrams to practise
Draw with pencil, use straight label lines, add arrows and write a precise caption.
- 1Neuron
- 2Reflex arc
- 3Human brain
- 4Phototropism experiment
CBSE examiner focus
- Separate reflex action from voluntary action
- Know brain-part functions and hormone-source pairs
- Explain tropism through unequal growth, not movement from place to place
Board-style practice
Compare nervous and hormonal coordination.
Answer framework: Compare signal type, route, speed, duration and target range, then provide examples.
Turn revision into marks with Eduvista
Use this guide for recall, then practise timed answers and get feedback. Eduvista combines visual notes, NCERT clarity, board-pattern tests and personal doubt support.