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Revision Notes

Control and Co-ordination

Maharashtra Board · Class 12 · Biology

Quick revision notes for Control and Co-ordination — Maharashtra Board Class 12 Biology. Key concepts, formulas, and definitions for last-minute revision.

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 Notes

Key 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?
Control and Co-ordination covers several key topics that are frequently asked in Maharashtra Board Class 12 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Control and Co-ordination — Maharashtra Board Class 12 Biology?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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