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Read the given statements and select the...

Read the given statements and select the incorrect one.

A

In Hydra, all neurons are similar and join to form a nerve cell.

B

In earthworms, nervous system consists of a dorsal nerve cord, paired ganglia and segmental nerves.

C

Brain is present in insects.

D

Planaria has two nerve cords that join to form rudimentary brain.

Text Solution

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The correct Answer is:
B
In earthworms, nervours system consists of a ventral nerve cord, paired ganglia and segmental nerves.
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NCERT FINGERTIPS-NEURAL CONTROL AND COORDINATION-Neural Control And Coordination
  1. In which animal, nerve cell is present but brain is absent ?

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  2. Read the given statements and select the incorrect one.

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  3. Neurons is sponges are

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  4. In the accompanying diagram of a part of the human body, the structure...

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  5. Afferent nerve fibre carries impulses from

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  6. Skeletal muscles are controlled by

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  7. In a human being, the number of cranial nerves is

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  8. The 3^(rd),6^(th) and 11^(th) cranial nerves are respectively

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  9. In a man, abducens nerve is injured. Which one of the following functi...

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  10. Which one of the following transmits impulses to central neural system...

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  11. The vagus nerve is the cranial nerve.

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  12. Which of the following nerves is purely a motor nerve ?

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  13. Which of the following cranial nerves of man is both sensory and motor...

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  14. Vagus nerve effects

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  15. Injury to vagus nerve is humans is not likely to affect

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  16. Which of the following cranial nerves has the highest number of branch...

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  17. How many pairs of cranial nerves are mixed nerves ?

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  18. Hypoglossal nerve controls the movements of

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  19. In a human being, the number of spinal nerves is

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  20. The flow chart given here shows functional organisation of the human n...

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