The word "Brain" is not related to:
Correct answer: A. Hydra
- A. Hydra
- B. Planaria
- C. Auditory relay centre
- D. 12 pairs
Explanation
Hydra is a genus of small, freshwater organisms belonging to the phylum Cnidaria. They possess a simple nervous system composed of a nerve net rather than a centralized brain. While they do not have a distinct brain like more complex organisms, they do have nerve cells that allow them to respond to stimuli such as touch or changes in their environment.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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