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Control and Coordination
Control and Coordination explains how the body of a plant or animal detects a change, processes that information, and produces a suitable response. In humans, the nervous system gives quick responses, while the endocrine system gives slower but longer-lasting control through hormones. In plants, coordination is mainly shown through tropic movements, where growth happens in a particular direction because of a stimulus. The chapter is important for board exams because it links body response, reflex action, hormones, and plant movement in a clear, application-based way.
Difficulty
Medium
Study time
80-100 min
Plan by time
Pick the window that matches what you have right now.
If you have 15 min
Last-pass revision
Skim the Quick Revision table — definitions, formulas, and the traps board examiners reuse.
Open Quick RevisionIf you have 45 min
Targeted practice
Read the high-priority concepts, then take the chapter MCQ quiz to find weak spots.
Start MCQ QuizIf you have 80 min
First full pass
Walk every concept in chapter order, then revise and quiz. Best for the first time you study this chapter.
Open Key ConceptsChapter Learning Map
Start with one of the buckets below, then open the full map when you want the complete concept roadmap.
Nervous System
Follow how a stimulus is detected, carried, and turned into a response.
Open mapHormonal Control
Revise slower chemical control through glands, hormones, and emergency response.
Open mapPlant Responses
See how plants respond through directional growth rather than movement from place to place.
Open mapKey Concepts
Concepts grouped the way the chapter is taught — open the group that matches what you want to revise.
Nervous System
high priorityFollow how a stimulus is detected, carried, and turned into a response.
Stimulus
A stimulus is any change in the surroundings or inside the body that can be detected and can produce a response.
Neuron
A neuron is a nerve cell that carries messages in the body in the form of electrical impulses.
Synapse
A synapse is the small gap between two neurons, or between a neuron and an effector, where the message passes from one cell to another.
Reflex Action
A reflex action is a quick, automatic response to a stimulus, usually controlled by the spinal cord for safety.
Hormonal Control
high priorityRevise slower chemical control through glands, hormones, and emergency response.
Pituitary Gland
The pituitary gland is a small endocrine gland at the base of the brain that controls several other endocrine glands and body functions.
Adrenaline
Adrenaline is a hormone released by the adrenal glands during fear, excitement, or emergency situations.
Plant Responses
medium prioritySee how plants respond through directional growth rather than movement from place to place.
Tropism
Tropism is the directional growth movement of a plant part in response to a stimulus.
Phototropism
Phototropism is the growth movement of a plant part in response to light.
Geotropism
Geotropism is the growth movement of a plant part in response to gravity.
Exam Intelligence
The traps that cost marks in this chapter, and how its main concepts turn up in the paper.
Common Traps
- Confusing stimulus with response in everyday examples.
- Reversing dendrite and axon functions in a neuron.
- Saying the brain controls every reflex before the spinal cord.
- Thinking a synapse carries impulses like a metal wire without chemical transfer.
- Treating hormones as nerve impulses and forgetting blood transport.
- Calling the pituitary the only gland that controls the body alone.
- Mixing up adrenaline with digestion or rest hormones.
- Using tropism for any plant movement without checking directional growth.
How CBSE Asks This Chapter
- Stimulus
Questions often ask students to identify stimulus and response in everyday situations, or to arrange the sequence correctly.
- Neuron
The exam may ask for the parts of a neuron, the direction of impulse flow, or the role of neurons in reflex action.
- Reflex Action
Board questions often ask for the pathway of reflex action, the role of spinal cord, or the reason reflexes are faster than voluntary actions.
- Synapse
Exam questions often ask the definition of synapse, the role of neurotransmitters, or why messages do not flow in a straight continuous wire-like manner.
Quick Revision
Concept, formula or equation to remember, and the trap that loses marks — in one scannable view.
Remember
stimulus is the change detected first, and response is the action that follows.Trap to avoid
Many students think stimulus and response mean the same thing.
Remember
dendrites receive impulses, axon carries impulses away from the cell body.Trap to avoid
Many students think every nerve cell does the same job.
Remember
reflex action is rapid, automatic, and generally coordinated by the spinal cord.Trap to avoid
Students often say reflex action is done by the brain first.
Remember
impulse passes across the synapse with the help of neurotransmitters.Trap to avoid
Many students think the impulse crosses the gap like electricity in a wire.
Remember
hormone is secreted by an endocrine gland, carried in blood, and acts on a target organ.Trap to avoid
Students often think hormones travel through nerves like electrical signals.
Remember
the pituitary gland secretes hormones that regulate other endocrine glands.Trap to avoid
Students often think the pituitary gland controls everything alone.
Remember
adrenaline is secreted in stress and prepares the body for immediate action.Trap to avoid
Students may think adrenaline is a nerve signal or a digestive chemical.
Remember
tropism is directional growth, and it may be positive or negative depending on movement towards or away from the stimulus.Trap to avoid
Students often call every plant movement tropism.
Remember
photo means light, so phototropism is directional growth caused by light.Trap to avoid
Students often think roots and shoots always react the same way to light.
Remember
geotropism is directional growth due to gravity; roots are usually positive and shoots are usually negative.Trap to avoid
Students often think downward growth always means the plant is weak or damaged.
| Concept | Remember | Trap to avoid |
|---|---|---|
| Stimulus | stimulus is the change detected first, and response is the action that follows. | Many students think stimulus and response mean the same thing. |
| Neuron | dendrites receive impulses, axon carries impulses away from the cell body. | Many students think every nerve cell does the same job. |
| Reflex Action | reflex action is rapid, automatic, and generally coordinated by the spinal cord. | Students often say reflex action is done by the brain first. |
| Synapse | impulse passes across the synapse with the help of neurotransmitters. | Many students think the impulse crosses the gap like electricity in a wire. |
| Hormone | hormone is secreted by an endocrine gland, carried in blood, and acts on a target organ. | Students often think hormones travel through nerves like electrical signals. |
| Pituitary Gland | the pituitary gland secretes hormones that regulate other endocrine glands. | Students often think the pituitary gland controls everything alone. |
| Adrenaline | adrenaline is secreted in stress and prepares the body for immediate action. | Students may think adrenaline is a nerve signal or a digestive chemical. |
| Tropism | tropism is directional growth, and it may be positive or negative depending on movement towards or away from the stimulus. | Students often call every plant movement tropism. |
| Phototropism | photo means light, so phototropism is directional growth caused by light. | Students often think roots and shoots always react the same way to light. |
| Geotropism | geotropism is directional growth due to gravity; roots are usually positive and shoots are usually negative. | Students often think downward growth always means the plant is weak or damaged. |
Practice
Use short concept checks first, then move into the full chapter test.
Free Chapter MCQ Quiz
Try a 15-question quiz from this chapter. Get instant score and unlock concept-wise analytics.
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