In kingdom animalia, beginning of cephalisation is evident in phyllum:
Correct answer: D. Platyhelminthes
- A. Porifera
- B. Protozoa
- C. Coelenterata
- D. Platyhelminthes
Explanation
Cephalisation refers to the evolutionary trend of the development of a head region where nervous tissue becomes concentrated, forming a brain and sensory organs. This process is a significant step in the complexity of animal evolution. Among the given options, platyhelminthes, or flatworms, are the first group in the animal kingdom to exhibit this characteristic. They have a simple nervous system with a concentration of nerve cells forming a primitive brain and sensory organs at the anterior end, marking the beginning of cephalisation.
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About Kingdom Animalia
Animals are multicellular, heterotrophic eukaryotes whose cells lack cell walls and chloroplasts, with specialised tissues in most groups. Coverage includes body symmetry, tissue layers, coelom, segmentation and levels of organisation, plus major phyla such as Porifera, Cnidaria, Platyhelminthes, Annelida, Arthropoda, Mollusca and Chordata.
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