Chapter 9 of 15
Revision Notes
Control and Co-ordination — Revision Notes
Maharashtra Board · Class 12 · Biology
Control and Co-ordination revision notes for Maharashtra Board Class 12 Biology: 4 topics in quick points. Includes Evolution of Nervous System, Neural.
44 questions25 flashcards5 concepts
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Key Topics to Revise
1
Evolution of Nervous System
- Sponges (Porifera) lack proper nervous system but show division of labor among cells
- Hydra (Cnidaria) has the most primitive nervous system - diffused nerve net with no polarity
- Planaria shows first centralized nervous system with brain-like cerebral ganglia and ventral nerve cords
2
Neural Tissue and Neurons
- Neural tissue consists of neurons (nerve cells) and neuroglia (supporting cells)
- Neuron structure: Cell body (cyton), dendrites (receive signals), axon (transmit signals)
- Cyton contains nucleus, Nissl's granules (riboproteins), and neurofibrils
3
Synapse and Nerve Impulse Transmission
- Synapse: junction between two neurons with synaptic cleft (20-30 nm gap)
- Electrical synapse: direct connection, faster, bidirectional (gap junctions)
- Chemical synapse: neurotransmitter-mediated, slower, unidirectional
4
Human Brain Structure
- Brain protected by skull, meninges (dura mater, arachnoid mater, pia mater), and CSF
- CSF: lymph-like fluid (100-120 ml), maintains pressure, provides nutrients, removes waste
- Forebrain: cerebrum (85% of brain), diencephalon (thalamus, hypothalamus), olfactory lobes
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Full NotesKey Concepts
Nervous systems evolved from simple nerveNeural tissue consists of neurons (nerveNerve impulses are electrochemical signals transmittedSynapses are junctions between neurons whereThe human brain consists of forebrain
Frequently Asked Questions
What are the important topics in Control and Co-ordination for Maharashtra Board Class 12 Biology?
Key topics in Control and Co-ordination include Evolution of Nervous System, Neural Tissue and Neurons, Synapse and Nerve Impulse Transmission, Human Brain Structure. Study these first, then practise questions on each for the Maharashtra Board Class 12 board exam.
How should I revise Control and Co-ordination for the Maharashtra Board Class 12 board exam?
Learn the core ideas first, then work through the 44 practice questions on Control and Co-ordination. Revise definitions regularly and use flashcards for quick recall before the exam.
Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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