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CBSE Class 11 (Science) Neural Control and Chemical Coordination — practice questions

Explore 172 free Neural Control and Chemical Coordination questions in CBSE Class 11 (Science) Biology. Open each question or exercise to read its content, reference answers and available explanation.

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Neural Control and Chemical Coordination questions and exercises with answers

Showing questions 1–30 of 172.

The resting membrane potential of a typical neuron is approximatelyRead the answer and worked solution →The rapid depolarisation phase of an action potential is caused byRead the answer and worked solution →Signals between two neurons across a chemical synapse are transmitted byRead the answer and worked solution →The neurotransmitter released at the NEUROMUSCULAR JUNCTION is:Read the answer and worked solution →The cerebral lobe primarily responsible for VISION is the:Read the answer and worked solution →The 'fight-or-flight' response is primarily mediated by the:Read the answer and worked solution →In the retina of the human eye, the COLOUR + sharp daylight vision is mediated by:Read the answer and worked solution →PARKINSON'S DISEASE is caused primarily by:Read the answer and worked solution →Match each hormone to its source gland.Read the answer and worked solution →Flip pairs — match cranial nerve to function.Read the answer and worked solution →NEET · Biology · Hormone ↔ GlandRead the answer and worked solution →NEET · Biology · Endocrine or Exocrine GlandRead the answer and worked solution →Hydra's nervous system is just a network of neurons. Insects are better organised because they have a:Read the answer and worked solution →The brain and spinal cord together form the:Read the answer and worked solution →A nerve fibre carrying an impulse from your skin to the CNS is:Read the answer and worked solution →Your heart rate and gut movement are controlled without thought by the:Read the answer and worked solution →A neuron has three major parts: cell body, axon and:Read the answer and worked solution →The bulb at the tip of an axon branch holding neurotransmitter vesicles is the:Read the answer and worked solution →The gaps between adjacent myelin sheaths are called:Read the answer and worked solution →At rest, the axon membrane is more permeable to:Read the answer and worked solution →The sodium-potassium pump moves 3 sodium ions out for every ___ potassium ions in.Read the answer and worked solution →The potential difference across a resting neuron membrane is the:Read the answer and worked solution →When the membrane's polarity flips at a stimulated site, it is said to be:Read the answer and worked solution →Junctions through which an impulse passes from one neuron to the next are:Read the answer and worked solution →Which type of synapse is faster but rare in humans?Read the answer and worked solution →The brain is protected inside the skull by three membranes called:Read the answer and worked solution →The two cerebral hemispheres are joined by a fibre tract called the:Read the answer and worked solution →The cerebral cortex looks grey because it is packed with:Read the answer and worked solution →Your body temperature and the urge to eat and drink are set by the:Read the answer and worked solution →The four round swellings on the dorsal midbrain are the:Read the answer and worked solution →

Worked practice questions

The resting membrane potential of a typical neuron is approximately

  1. +70 mV
  2. +30 mV
  3. 0 mV
  4. −70 mV
Show answer and solution

Correct answer: D. −70 mV

About −70 mV (inside negative relative to outside). Maintained by the Na⁺/K⁺ pump and the membrane's selective K⁺ permeability.

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The rapid depolarisation phase of an action potential is caused by

  1. K⁺ flowing out of the cell
  2. Na⁺ rushing into the cell through voltage-gated channels
  3. Cl⁻ flowing into the cell
  4. active pumping of Na⁺ out
Show answer and solution

Correct answer: B. Na⁺ rushing into the cell through voltage-gated channels

Voltage-gated Na⁺ channels open when the membrane is depolarised to threshold. Na⁺ floods in, driving the membrane potential to about +30 mV — the upstroke of the action potential.

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Signals between two neurons across a chemical synapse are transmitted by

  1. direct electrical contact
  2. neurotransmitters released into the synaptic cleft
  3. diffusion of Na⁺ ions
  4. passive heat exchange
Show answer and solution

Correct answer: B. neurotransmitters released into the synaptic cleft

The action potential triggers vesicles in the axon terminal to release neurotransmitter into the cleft. The neurotransmitter diffuses to receptors on the next neuron, generating a postsynaptic potential.

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