Topic 5.3: Classification of Biodiversity

An animal has the following characteristics: bilateral symmetry, mouth but no anus, ribbon shape. Which phylum does the animal belong to?

• Mollusca

• Cnidaria

• Annelida

• Platyhelmintha

An organism has the following characteristics:

single opening for ingestion and egestion

radial symmetry

tentacles with stinging cells.

In what phylum would it most likely be classified?

• Annelida

• Cnidaria

• Platyhelminthes

• Porifera

Which organism is a member of the filicinophyta? (Note that these are not to scale)

• 
• 
• 
• 

The image shows an organism belonging to the Kingdom Animalia. What feature does this organism have in common with all members of the phylum chordata?

• Legs and wings

• Mouth but no anus

• Bilateral symmetry

• Chitinous exoskeleton

Which phyla have bilateral symmetry?

• annelida, arthropoda, platyhelmintha

• porifera, arthropoda, platyhelmintha

• cnidaria, porifera, mollusca

• porifera, annelida, mollusca 

Which is the hierarchy of taxa in order of decreasing numbers of species?

• domain, phylum, order, family

• phylum, order, family, class

• domain, phylum, order, class

• phylum, class, family, order

The images show a guinea pig, a mouse, a horse and a whale. Which features support the classification of these four species in the same class?

• All are warm-blooded and breathe air.

• All have evolved from primates.

• All have hair or fur and feed their young with milk.

• All have a notochord, vertebrae and give birth to live young.

Which phylum shows radial symmetry?

• Annelida

• Cnidaria

• Platyhelmintha

• Porifera

Which of the organisms A–D, identified by the key, represents a reptile?

• A

• B

• C

• D

Below is a phylogenetic tree of the three domains.

There are important differences between the three domains. Which of these domains have organelles?

• Eubacteria and archaea

• Archaea only

• Eukaryotes and archaea

• Eukaryotes only