Comparative Endocrine Systems in Animals · NCERT Biology

Which group of animals lacks specialized endocrine glands and relies mainly on neurosecretory cells for hormonal regulation?

  1. Annelids
  2. Arthropods
  3. Cnidarians
  4. Vertebrates
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Correct answer: Cnidarians

Cnidarians do not possess distinct endocrine glands. They rely on neurosecretory cells that release chemical messengers for coordination.

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