Question

Photoreceptors of earthworm occur on:
A. Clittellum
B. Anal segment
C. Dorsal surface
D. Lateral sides

Answer 1

Hint: Earthworms don't have eyes (albeit a few worms do), nonetheless, they do have specific photosensitive cells called "light cells of Hess". These photoreceptor cells have a focal intracellular depression (phaosome) loaded up with microvilli. Just as the microvilli, there are a few tactile cilia in the phagosome which are fundamentally autonomous of the microvilli.

Complete answer:
The photoreceptors are conveyed in many pieces of the epidermis yet are more focused on the back and sides of the worm. A moderately modest number happens on the ventral surface of the first fragment. They are generally various in the prostomium and lessen in thickness in the initial three segments; they are not many in number past the third segment. The photoreceptors are circulated in many pieces of the epidermis yet are more focused on the back and sides of the worm. Consequently, photoreceptors are available on the dorsal surface.
Hence, option C is correct.

Note: An earthworm is an earthbound invertebrate that has a place with the request Opisthopora. They display a cylinder inside an a-tube body plan, are remotely divided with related interior division, and generally have setae on all segments. They happen worldwide where soil, water, and temperature permit. These photoreceptor cells have a focal intracellular depression (phaosome) loaded up with microvilli