Control and Coordination One Shot Notes with Important Query

Introduction

Before starting the chapter Control and Coordination, let us take a quick glance at the previous chapter Life Processes. In Life Processes, we studied how living organisms perform essential activities such as nutrition, respiration, transportation, and excretion to stay alive. Those processes explained what functions are necessary for survival.

Now in this chapter, we will understand how the body controls and coordinates all these life processes together smoothly and efficiently.

For example:

• How does the body react immediately when we touch a hot object?
• How do muscles, glands, and organs work together?
• How does the brain send instructions to different body parts?
• How do plants respond to sunlight, gravity, and touch without having a brain?

The answers to all these questions are explained in the chapter Control and Coordination.

In humans and animals, coordination mainly occurs through:

1. Nervous System
2. Endocrine System (Hormonal System)

In plants, coordination occurs through:

• Chemical coordination
• Plant hormones
• Tropic movements

This chapter is very important for CBSE Board Exams because it builds the foundation for advanced biology concepts such as neurobiology, hormones, reflex actions, and body regulation systems.

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Table of Contents

Section	Topics Covered
1	Introduction to Control and Coordination
2	Need for Control and Coordination
3	Nervous System in Animals
4	Neuron Structure and Function
5	Reflex Action and Reflex Arc
6	Human Brain and Its Parts
7	Central Nervous System (CNS)
8	Peripheral Nervous System (PNS)
9	Endocrine System and Hormones
10	Major Human Hormones
11	Coordination in Plants
12	Plant Movements
13	Plant Hormones
14	Important Differences
15	Important Abbreviations
16	Board Important Points
17	Advanced Level Concepts
18	Conclusion

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1. Introduction to Control and Coordination

English Explanation

Control and coordination help living organisms respond properly to changes in their environment. In humans and animals, this process is mainly controlled by the nervous system and endocrine system.

The body receives stimuli, processes information, and gives responses through muscles or glands.

हिंदी व्याख्या

Control and Coordination वह प्रक्रिया है जिसके द्वारा जीव अपने आसपास के वातावरण में होने वाले परिवर्तनों के अनुसार प्रतिक्रिया देते हैं। मनुष्य में यह कार्य मुख्य रूप से Nervous System और Endocrine System द्वारा किया जाता है।

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2. Need for Control and Coordination

Important Points

• Helps organisms survive.
• Maintains body balance.
• Controls body activities.
• Responds to external stimuli.
• Coordinates movement and growth.

हिंदी में

• जीवित रहने में सहायता करता है।
• शरीर का संतुलन बनाए रखता है।
• सभी अंगों को नियंत्रित करता है।
• बाहरी उत्तेजनाओं पर प्रतिक्रिया देता है।
• वृद्धि एवं विकास को नियंत्रित करता है।

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3. Nervous System in Animals

The nervous system consists of:

1. Brain
2. Spinal Cord
3. Nerves

Functions

• Receives information
• Processes signals
• Sends instructions
• Controls voluntary and involuntary actions

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4. Neuron Structure and Function ( Control and Coordination )

Definition

Neuron is the structural and functional unit of the nervous system.

Parts of Neuron

Part	Function
Dendrites	Receive impulses
Cell Body	Controls activities
Axon	Carries impulses away
Nerve Ending	Transfers signals

हिंदी में

Neuron तंत्रिका तंत्र की मूल इकाई है जो संदेशों का आदान-प्रदान करती है।

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5. Reflex Action and Reflex Arc

Reflex Action

A quick automatic response to a stimulus.

Example

• Hand withdrawal from hot object
• Blinking of eyes

Reflex Arc

Path followed during reflex action.

Stimulus → Receptor → Sensory Neuron → Spinal Cord → Motor Neuron → Effector

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6. Human Brain and Its Parts

Brain Part	Function
Forebrain	Thinking, memory, intelligence
Midbrain	Visual and auditory reflex
Hindbrain	Balance, heartbeat, breathing

Important Points

• Cerebellum controls body balance.
• Medulla controls involuntary actions.
• Brain acts as the control center of body.

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7. Central Nervous System (CNS)

Includes

• Brain
• Spinal Cord

Functions

• Information processing
• Coordination of body activities

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8. Peripheral Nervous System (PNS)

Includes

All nerves arising from brain and spinal cord.

Functions

Connects CNS with body organs.

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9. Endocrine System and Hormones

Hormones

Chemical messengers secreted by endocrine glands.

Characteristics

• Slow action
• Long-lasting effect
• Carried through blood

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10. Major Human Hormones

Gland	Hormone	Function
Pituitary	Growth Hormone	Body growth
Thyroid	Thyroxine	Metabolism control
Pancreas	Insulin	Controls blood sugar
Adrenal	Adrenaline	Emergency response
Testes	Testosterone	Male characteristics
Ovary	Estrogen	Female characteristics

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11. Coordination in Plants

Plants do not have nerves, but they respond through chemical coordination.

Types of Plant Movements

1. Tropic Movement
2. Nastic Movement

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12. Plant Movements

Movement	Stimulus
Phototropism	Light
Geotropism	Gravity
Hydrotropism	Water
Thigmotropism	Touch

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13. Plant Hormones

Hormone	Function
Auxin	Growth in shoots
Gibberellin	Stem growth
Cytokinin	Cell division
Abscisic Acid	Inhibits growth
Ethylene	Fruit ripening

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14. Important Differences ( Control and Coordination )

Nervous System vs Hormonal System

Nervous System	Hormonal System
Fast response	Slow response
Uses neurons	Uses hormones
Short duration	Long duration
Electrical signals	Chemical signals

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15. Important Abbreviations

Abbreviation	Full Form
CNS	Central Nervous System
PNS	Peripheral Nervous System
GH	Growth Hormone
DNA	Deoxyribonucleic Acid
ABA	Abscisic Acid

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16. Board Important Points ( Control and Coordination )

Most Important Topics

• Reflex Action
• Reflex Arc Diagram
• Human Brain Functions
• Hormones and Glands
• Plant Hormones
• Tropic Movements
• Difference between Nervous and Hormonal Coordination

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17. Advanced Level Concepts

Neurotransmitters

Chemical substances that help in transmission of nerve impulses between neurons.

Synapse

Junction between two neurons.

Homeostasis

Maintenance of stable internal body conditions.

Endocrine Feedback Mechanism

Hormone levels are regulated by feedback systems.

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Quick Revision Notes ( Control and Coordination )

• Brain is the control center of body.
• Neurons carry electrical impulses.
• Reflex actions are controlled by spinal cord.
• Hormones are chemical messengers.
• Auxin helps in plant growth.
• Adrenaline is called emergency hormone.

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Conclusion ( Control and Coordination )

Control and Coordination is one of the most important chapters of Class 10 Science because it explains how living organisms respond and survive in changing environments. Understanding neurons, brain functions, hormones, reflex actions, and plant responses helps students build strong concepts for board exams as well as higher-level biology studies.

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