Question

Animals possess nerve network or nervous system to respond to their environment. But the single called Amoeba does not possesses any nerve cell, so, how it come to know whether a particle it encounters is a grain or sand and not its dinner

• A. By chemotaxis
• B. By skin
• C. By hormones
• D. All of these

Answer 1

Answer: (A)

By chemotaxis

Although the Amoeba has no sense organs ,It responds to chemical stimuli .It make this determination by chemotaxis ,a kind of chemical sense .This is the same response mechanism that our whit blood use when they encounter and phyagocytize a pathogen .