Chapter 24, Problem 26A

Summary Introduction

To write:

The term that does not belong in the group.

Introduction:

Sponges have walls which are linked with many small pores referred to as ostia that permit water circulate the sponge.  They filter water to attain their food so they're recognised as filter feeders. Gemmules are internal buds observed in sponges and are involved in asexual reproduction. A nematocyst is a capsule that holds a coiled, threadlike tube containing poison and barbs, which is found in cnidarians.

Explanation of Solution

A sponge is covered with tiny pores, known as ostia, which lead internally to a system of canals and eventually out to one or more larger holes, known as oscula. In order get food; sponges filter water by their bodies in a process called as filter-feeding. Water is drawn into the sponge through tiny holes known as incurrent pores. Gemmules are internal buds observed in sponges and are involved in asexual reproduction. Nemotocysts are found in cnidarians.A nematocyst is a capsulethat holds a coiled, threadlike tube containing poison and barbs.

Conclusion

A sponge contains tiny pores, filter feeding and also gemmules which are involve in reproduction. Nematocysts do not belong in the group because these are found in Cnidarians.