Question

chemoreceptor for testing chemical nature of water in molluscs are​

Answer 1

Explanation:

The formation and operation of the peripheral nervous system can be observed and studied in mollusks using as an example the primitive chemoreceptor organ, the osphradium, which is connected to the visceral arch of the CNS and analyzes the physicochemical properties of water in the mantle cavity.

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Answer 2

Osphradium is the primitive chemoreceptor that helps in testing the chemical nature of water in mollusks.

Explanation:

• The osphradium is a pigmented chemosensory epithelium patch in the mantle cavity present in six of the eight extant classes of mollusks.
• The major function of osphradium is to test the incoming water for silt and food particles.
• The osphradium also acts as an olfactory organ in certain mollusks and is linked with the respiratory organ.
• The osphradium is a single or paired sense organ connected with one of the visceral ganglia and situated near the gill of most aquatic mollusks to test the purity of the water passing to the gills.