A) Galvanotaxis
B) Rheotaxis
C) Geotaxis
D) Thigmotaxis
Correct Answer: B
Solution :
The responses to stimuli are called, taxes. These are named according to nature of stimulus as- (i) Galvanotaxis: When an electric current is passed -through water, Amoeba stops moving and withdraws pseudopodia. (ii) Rheotaxis: It is response of Amoeba to current of air or water. (iii) Geotaxis: The response of Amoeba to gravity is mostly positive as it drops to the bottom of container filled with water. (iv)Thigmotaxis: It is the response of Amoeba to contact: It responds positively to those objects upon which it glides or rest.
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