Question

Where is stigma is located in Euglena?​

Answer 1

Answer:

A red eyespot (stigma) is located near the base of the reservoir (Fig. 3.4) and this filters the light and focuses it on the paraflagellar body, and is involved in the phototaxis of this alga (Häder and Iseki, 2017). Euglena lacks a cell wall.

Answer 2

Answer:

In the green one-celled organism Euglena, the eyespot is located in the gullet, at the base of the flagellum (a whiplike locomotory structure). A cup-shaped mass of pigment rods shields a sensitive area of the flagellar base from light coming from the direction of the opposite end of the organism. The light-sensitive region apparently influences flagellar motion in such a manner that the organism moves toward light.