Class 10 Science - KERALA
Control and Coordination
The chapter 'Control and Coordination' in Class 10 Science explores how living organisms respond to internal and external stimuli to maintain survival and homeostasis. Students learn about the nervous system, reflex actions, human brain functions, and chemical coordination through plant and animal hormones. Understanding how nerve impulses travel across synapses and how hormones regulate growth is crucial, as this chapter frequently features in Kerala SCERT board exams with direct questions on brain structure, reflex arcs, and plant tropisms.
Start Learning FreeKey Concepts
Nervous System and Neurons
Neurons are the structural and functional units of the nervous system that transmit electrical impulses across synapses using neurotransmitters.
Reflex Action and Reflex Arc
A reflex action is an automatic, rapid, and involuntary response to a stimulus, controlled primarily by the spinal cord through a pathway called a reflex arc.
Human Brain
The brain is the central processing unit divided into the forebrain (thinking and voluntary actions), midbrain, and hindbrain (involuntary actions like heartbeat and posture).
Plant Movements and Tropism
Plants respond to environmental stimuli through directional growth movements called tropisms, such as phototropism (light) and geotropism (gravity), mediated by plant hormones like auxin.
Endocrine System in Humans
Endocrine glands secrete chemical messengers called hormones directly into the blood to regulate metabolism, growth, and development.
Important Formulas
Board Exam Info
In Kerala (SCERT) Class 10 board examinations, this chapter typically carries around 6 to 8 marks. Common question types include diagram-based questions (human brain, reflex arc), matching hormones with their functions, differentiating between nervous and hormonal coordination, and explaining plant tropisms.
Frequently Asked Questions
Voluntary actions are consciously controlled by the cerebrum (e.g., writing, talking), whereas involuntary actions happen automatically without conscious thought and are controlled by the hindbrain and spinal cord (e.g., heartbeat, breathing).
What is a synapse?
A synapse is the microscopic gap between the axon terminal of one neuron and the dendrite of the next neuron, where electrical signals are converted into chemical signals (neurotransmitters) to pass across.
Why is plant coordination slower than animal coordination?
Plants lack a nervous system and muscle tissues. Instead, they rely on chemical signals (hormones) and water-pressure changes for movement, which is a much slower process compared to nerve impulse transmission in animals.
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