In which animal is nerve cell present but brain absent

In which animal is nerve cell present but brain absent?

Options

(a) Sponge
(b) Earthworm
(c) Cockroach
(d) Hydra

Correct Answer:

Hydra

Explanation:

A primitive type of nervous system,without brain is found in the form of intra epidernal nerve net.However,there is no brain in Hydra to coordinate the response.

admin:

Related Questions

  1. Ozons (O₃) layer in stratosphere is effected by
  2. Etiolation in plants is caused when
  3. Acting binding sites are located on
  4. Of the total incident solar radiation the proportion of PAR is:
  5. Aerobic respiration produces more usable chemical energy than fermentation