NEET BIOLOGY

Detailed explanation-1: -Cephalization is an evolutionary trend in which, over many generations, the mouth, sense organs, and nerve ganglia become concentrated at the front end of an animal, producing a head region. This is associated with movement and bilateral symmetry, such that the animal has a definite head end.

Detailed explanation-2: -3.13 B). Cephalization is the evolutionary development of an anterior head with concentrated feeding organs and sensory tissues in animals. Bilaterally symmetrical organisms typically move towards their environment at the anterior end.

Detailed explanation-3: -Cephalization is an evolutionary trend to concentrate sensory and neural organs anteriorly in a head. In the field of the neurosciences, it may be defined as the progressive growth of the (cephalic) nervous system during the evolution of animal life.

Detailed explanation-4: -Three groups of animals display a high degree of cephalization: vertebrates, arthropods, and cephalopod mollusks. Examples of vertebrates include humans, snakes, and birds. Examples of arthropods include lobsters, ants, and spiders. Examples of cephalopods include octopuses, squid, and cuttlefish.

Detailed explanation-5: -Most kinds of animals have particularly important sets of sense organs-such as eyes, ears, and sensory tentacles-at their anterior end. This is easy to understand because when an animal moves forward in its environment, its anterior end is the first to make contact with new dangers or opportunities.