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Question
Which feature is shown by flatworms?
I. Acoelomate
II. Radial symmetry
III. Development of a head
Which feature is shown by flatworms?
I. Acoelomate
II. Radial symmetry
III. Development of a head
II. Radial symmetry
III. Development of a head
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Solution
The correct option is D I and III only
Flatworms (Platyhelminthes) are the simplest bilaterally symmetrical organisms i.e. a sagittal section (lengthwise vertical cut) or longitudinal (lengthwise horizontal) cut divide the body into two equal halves. Since they have the solid body, they are acoelomate and have no body cavity. They exhibit cephalization which refers to the development of a head to concentrate sensory structures. Thus, the correct answer is D.
Flatworms (Platyhelminthes) are the simplest bilaterally symmetrical organisms i.e. a sagittal section (lengthwise vertical cut) or longitudinal (lengthwise horizontal) cut divide the body into two equal halves. Since they have the solid body, they are acoelomate and have no body cavity. They exhibit cephalization which refers to the development of a head to concentrate sensory structures. Thus, the correct answer is D.
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