Control and Coordination Notes

✓ Free notes Class 10 Science 1 study file

About these notes

Class 10 Science Control and Coordination — Merit Spring ROH notes explain how animals and plants detect stimuli and respond, covering neuron structure and synapse, reflex action and reflex arc, nervous system divisions, major endocrine glands and hormones, and plant growth regulators like auxins. Main sub-topics: neurons, reflexes, CNS/PNS (somatic and autonomic), pituitary/thyroid/adrenal/pancreas, adrenaline effects, phototropism and gravitropism, and sense organs. For Class 10 students preparing for board and term exams, these notes plus site chapter tests and mock tests support revision. Useful search phrases: notes, important questions, MCQ, question answer, chapter test.

Key points you will learn

Class 10 Science Control and Coordination — neuron: dendrites, cell body, axon, myelin sheath and synapse; electrical impulse then chemical transmission.
Reflex arc rule: receptor → sensory neuron → spinal cord (interneuron) → motor neuron → effector; reflexes are rapid and involuntary.
Nervous system divisions: Central (brain, spinal cord) and Peripheral (somatic and autonomic — sympathetic and parasympathetic).
Endocrine glands and hormones: pituitary, thyroid, adrenal (adrenaline), pancreas; hormones travel in blood and cause slower, long-lasting effects.
Adrenaline (adrenal medulla) increases heart rate, dilates bronchi, and raises blood glucose in emergency 'fight-or-flight' responses.
Plant regulators: auxins made in shoot apices cause cell elongation on the shaded side producing phototropism; similar uneven growth explains gravitropism.
Sense organs and receptors: olfactory receptors in upper nasal cavity; reflexes often integrate at spinal cord before brain input.

What is inside this chapter

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Control and Coordination

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Questions students ask

How to answer a reflex action question in board exams?

Begin by defining reflex action in one line; draw and label the reflex arc diagram, then describe steps receptor → sensory neuron → interneuron → motor neuron → effector, give an example and mention involuntary rapid response.

Which gland secretes adrenaline and name three physiological changes it causes?

Adrenaline is secreted by the adrenal medulla; it raises heart rate, dilates bronchi to improve breathing, and elevates blood glucose to supply immediate energy during stress or emergency.

How does a reflex action occur when you touch a hot object?

A receptor in the skin detects heat and sends an impulse via a sensory neuron to spinal cord interneurons; a motor neuron then triggers muscle contraction to withdraw the hand while the brain is informed afterward.

Where are auxins synthesised and how do they cause phototropism?

Auxins are synthesised in shoot apices and young leaves; unequal distribution results in more cell elongation on the shaded side of a stem, causing the shoot to bend toward light.

Where to find Class 10 Science Control and Coordination notes and chapter test?

Find the chapter notes on the Merit Spring ROH Control and Coordination page; the site also provides chapter tests and mock tests for revision. Use topic headings (neuron, reflex arc, hormones, plant regulators) to locate question answer practice.

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