Question

A student performed an investigation on green single-celled organisms called Euglena. Two samples of Euglena were placed in two different containers of water taken from the same source. One sample was kept in a dark area. The other sample was kept in a lighted area. The student recorded the observations in the table shown. Which of the following observations represents a response to stimuli?

a) Uses a flagellum to move
b) Moves toward light
c) Some divide into two small organisms
d) Various sizes

Answer 1

The observation that represents a response to stimuli in the investigation on Euglena is (b) Moves toward light.

Step-by-step explanation:

The observation that represents a response to stimuli in the investigation on Euglena is (b) Moves toward light. Organisms, including Euglena, can respond to stimuli such as light. In this case, Euglena move towards the lighted area, indicating a positive response. Movement toward a stimulus is considered a positive response, while movement away from a stimulus is considered a negative response.