Concept:The diagram shows a
Euglena, and the part labelled II is the light-sensitive eyespot present at its anterior end.
Explanation:In
Euglena, the part labelled II is called the eyespot or stigma.
It is a small, reddish structure located near the base of the flagellum.
Its main function is to detect light, allowing the organism to move toward or away from light.
The eyespot is not the nucleus, which controls cell activities and lies in the centre.
It is also not the basal granule, which anchors the flagellum.
It is not the contractile vacuole, which removes excess water.
Therefore, among the given options, the correct identification for part II is the eyespot.
Answer:B. eyespot
