Stimulus–response in organisms: Movements due to light (phototactic/phototropic responses) are characteristically shown by which organism? Focus on simple motile protists in basic biology curricula. Choose the correct organism.
General Knowledge
Biology
Difficulty: Easy
Choose an option
Answer
Correct Answer: Euglena
Explanation
Concept / ApproachEuglena has a stigma (eyespot) and exhibits phototaxis (movement toward/away from light). While higher plants show phototropism, many school-level MCQs highlight phototactic movement in Euglena.
Why others are incorrectParamecium and Amoeba show taxes/kinesis to various stimuli but lack a distinct eyespot; Plasmodium is non-motile in this sense within the host.
Final AnswerEuglena shows light-directed movement.