Question

Osphradium of Pila globosa is a
A. Photoreceptor
B. Chemoreceptor
C. Thermoreceptor
D. Tangoreceptor

Answer 1

Hint: The osphradium is a sensory organ which monitors the water & flows penetrating the mantle cavity. It has a patch of sensory epithelium on the gill membranes that act as a receptor to specify the amount of sediment in the water being taken inside. Osphradium is an olfactory organ attending in certain Mollusks/Pila. It is associated with the respiration organ.

Complete answer:
Option – A, A photoreceptor cell is a specialized category of neuroepithelial cell established in the retina which is capable of visual phototransduction. The great biological significance of photoreceptors is that they convert the light that is visible electromagnetic radiation into signals which can stimulate biological processes.
Option – B, A chemoreceptor is also known as chemosensory. It is a specialized sensory receptor cell which transduces a chemical substance that is endogenous or induced in order to generate a biological signal. This signal may be in the pattern of an action potential if the chemoreceptor is a neuron or in the structure of a neurotransmitter that can activate a nerve fibre if the chemoreceptor is a specialized cell, like taste receptors, or an internal peripheral chemoreceptor, like the carotid bodies. Osphradium of Pila globosa is a chemoreceptor. It is discovered near the left nuchal opening. It understands the incoming water for silt and possible food particles.
Option – C – A Thermoreceptor is a non-specialised sense receptor, or more accurately the receptive quantity of a sensory neuron, that codes absolute as well as relative changes in temperature, primarily within the innocuous range.
Option – D – The whole body surface is tango receptive, except for portions covered by thick, rigid shells (as in molluscs). Mechanical connection with locally impairs the body surface; receptors generally are touch spots or free nerve culmination within the skin, often correlated with such specialized structures as tactile hairs.

Thus, the right answer to the question is Option B “Chemoreceptor”.

Note:
Pila globosa is an amphibious animal. Osphradium is a minor leaf-like configuration, fastened to the roof of the pulmonary chamber near the left nuchal lobe. It is olfactory in the procedure. They have some sensory organs that promote and regulate their physical as well as chemical processes of the body.