Question

Which of the following are not photoreceptors?

• A. Rods and cones of a human eye
• B. Ommatidia of cockroach
• C. Ruffini's corpuscles
• D. All of the above

Answer 1

The correct option is C Ruffini's corpuscles

Sensory receptors that respond to mechanical stress or distortion are called Mechanical receptors.
Generally, there are 4 major types of mechanical receptors in glabrous (hairless) skin they are (1)Pacinian corpuscles (2)Meissner's corpuscles (3)Merkel's disc and (4)Ruffini corpuscles.
Ruffini corpuscles detect tension deep in the skin and fascia.
Hence Ruffini's corpuscles are not photoreceptors.
So, the correct option is 'Ruffini's corpuscles'.