Question

Photoreceptor in Pheretima are –
(a) on ventral side of skin
(b) on dorsal side of skin
(c) on both
(d) in clitellum

Answer 1

Answer:

Dorsal Surface of Pheretima.

Answer 2

The photoreceptor in pheritima:

• Option “B” is correct i.e. on the dorsal side of the skin.

• The photoreceptor in pheritima is present on dorsal side of skin.

• Pheritema is an earthworm. Earthworms do not have eyes they do have particular photosensitive cells termed as "light cells of Hess". These photoreceptor cells have an essential intracellular cavity filled with microvilli.  

•  The photoreceptors are dispersed in most parts of the epidermis but are more intense on the back and sides of the worm. Therefore, photoreceptors are found on the dorsal surface.

Hope it helped....