Neural System Organization Across Vertebrates — NEET Biology
📚 Practice ConceptThe neural system of all animals is composed of highly specialised cells called neurons which can detect, receive and transmit different kinds of stimuli. The neural organisation is very simple in lower invertebrates. For example, in Hydra it is composed of a network of neurons. The neural system is better organised in insects, where a brain is present along with a number of ganglia and neural tissues. The vertebrates have a more developed neural system.
Which of the following statements are correct? 1. The neural system of Hydra is composed of a network of neurons. 2. Insects have a more organised neural system with a brain and ganglia. 3. In vertebrates, neural organisation is less developed than in insects. 4. Neurons are capable of detecting, receiving and transmitting stimuli. 5. Human neural system includes only the brain and spinal cord.
View solution & NCERT explanation
Correct answer: A — 1, 2 and 4 only
Statements 1 and 2 are correct (Hydra has a simple nerve net; insects have a brain and ganglia). Statement 3 is false → vertebrates have a more developed system. Statement 4 is true → neurons are excitable and can transmit stimuli. Statement 5 is false → human neural system = CNS + PNS, not just brain & spinal cord.
What does NCERT say about neural system all animals?
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