Which one of the following is not a feature of the nervous system of Planaria?
Correct answer: C. No specialized sensory organs are present
- A. Neurons are differentiated into sensory, motor, and associative neurons
- B. Nerves are present
- C. No specialized sensory organs are present
- D. All of the above options are correct
Explanation
OPTION A: In Planaria, there is a differentiation of neurons into sensory associative and motor neurons. In Planaria, associative neurons are present in the brain and longitudinal nerves. Sensory neurons carry impulses to the 'brain' or nerves and motor neurons carry impulses from the central nervous system to different parts of the body.OPTION B: There are definite nerves, the longitudinal and lateral in Planaria.OPTION C: In Planaria at the anterior region, sense organs in the form of eyes and chemoreceptors are present. The receptor cells sensitive to pressure and touch-are present in Planaria. Hence, C is the correct option.
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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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