Question

Chordotonal organs are connected with sense of?
A) Hearing
B) Smell
C) Taste
D) Thermoreceptor

Answer 1

Chordotonal organs are broadened receptor organs in pests and other arthropods. They are situated at most joints and are composed of clusters of scolopidia that either directly or indirectly fix two joints or sense their movements relative to each other.

Complete answer:
Chordotonal organs are intradermal receptors that usually act as proprioceptors or are indulged in hearing. They consist of ordinary constituents known as scolopidia, connected to the cuticle by one or more of their ends. They can be lonely or grouped in bunches. Thus, Chordotonal organs are connected with a sense of hearing.

They can comprise both exterior- and proprioceptive jobs, such as sensing auditory stimuli or leg movement. The femoral chordotonal organ is thought to be purposefully homologous to muscle spindles.

The nose is the appendage of smell. Odorous particles getting the upper part of the nasal cavity excite the specific olfactory epithelium in which the receptors are located. The receptors for taste are dispersed over the tongue, palate, mouth, and pharynx, the tongue being the major organ. Thermoreceptor like the skin is the main sense organ and can sense several types of environmental changes through the vital sense of touch.

Hence, the correct answer is option (A).

Note: Single scolopidia with only having solitary sensory, bipolar neuron, or up to many thousand scolopidia, each prepared with up to four sensory neurons constitutes chordotonal organs. Each bipolar sensory neuron has an apical dendritic structure with a cilium thickly packed with microtubules and bounded by two specialized cells. The Johnston’s organ is a case of an amphinematic chordotonal organ. The purposeful significance of the morphological variations of the two forms is unidentified but may confer dissimilar viscoelastic properties on the sensory units.