Question

Pick the odd pair out of the following.

• A. Porifera - Choanocytes
• B. Monera - Eukaryote
• C. Coelenterata - Nematocyst
• D. Annelida - Metamerism

Answer 1

Answer: (B)

The kingdom Monera is comprised of two groups - archaebacteria and eubacteria. These are the prokaryotic organisms which do not have well-developed cellular structures like the nuclear membrane, mitochondria, chloroplast, etc. The eukaryotic organisms are placed under the kingdom of protists, fungi, plants and animals.

Choanocytes are the specialized ciliated cells in the inner cavity/lumen of the poriferans which helps in the movement of food particles.

In coelenterates, the nematocysts are stinging type of cells which are helpful in defence.

The body of the annelids have repeated segments and show the phenomenon of metamerism in which the presence of similar organs is observed with the repeating segments.

Thus, the correct answer is option A.