State the importance of the following responses:

(a) Chemo-taxis in pollen grains

(b) Positive rheotaxis in butterfly

(c) Positive aerotaxis to aerobic bacteria.

Answer and Explanation:

Chemo-taxis in pollen grains - this enables fertilization to take place

Positive rheotaxis in butterfly - this behaviour leads them to hold their position in a stream rather than being swept downstream.

Positive aerotaxis to aerobic bacteria - enables the bacteria to move from an area of low to one of high oxygen concentration.