Question:

A sponge differs from all other matazoans in having:

Updated On: Aug 15, 2022
  • nerve cells
  • absence of blood
  • numerous mouthlets and one exit
  • none of these
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The Correct Option is C

Solution and Explanation

Body of sponges in perforated by many pores (ostia) through which water enters the paragastric cavity opening to exterior by a large opening called Osculum through which water exists.
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Concepts Used:

Biological Classification

The process of grouping living organisms into categories is called biological classification. The most modern 5-kingdom classification was put ahead by an eminent scientist R.H.Whittaker. The five-kingdom classification is based on the criteria like cell structure, mode of nutrition, body form, and reproduction. One of the most important characteristics of this system is that it follows the evolutionary sequence of living organisms. The organisms are classified into distinct taxa or levels like Kingdom, Phylum, Division, Class, Order, Family, Genus, and Species. The 5 kingdoms are as follows:

Biological Classification