1. IB Biology Topic 5.5 - Classification

2. Topics: 5.5.1 Outline the binomial system of nomenclature
List seven levels in the hierarchy of taxa using an example from two different kingdoms for each level.
Distinguish between the following phyla of plants, using simple external recognition features: bryophyta, filicinophyta, coniferophyta and angiospermophyta.
Distinguish between the following phyla of animals, using simple external recognition features: porifera, cnidaria, platyhelminthes, annelida, mollusca and arthropoda.
Apply and design a key for a group of up to eight organisms.

3. 5.5.1 Outline the binomial system of nomenclature
Species are a group of organisms with similar characteristics which can interbreed and produce fertile offspring whereas a genus is a group of similar species.
Species need an international name and so biologists name them using the binomial system of nomenclature.

4. Each species is given two names
Each species is given two names. The first is the genus name and is given an upper case first letter.
I.E. Homo
The second is the species name and is given a lower case first letter.
I.E. sapiens
Homo sapien is the correct binomial nomenclature for humans.

5. List seven levels in the hierarchy of taxa using an example from two different kingdoms for each level.
Red Kangaroo: Kingdom: Animalia Phylum: Chordata  Class: Mammalia Order: Diprotodontia Family: Macropodidae Genus: Macropus Species: rufus

6. White Oak tree: Kingdom: Plantae Phylum: Magnoliophyta Class: Magnoliopsida  Order: Fagales Family: Fagaceae Genus: Quercus Species: alba

7. 5.5.3

8. 5.5.4 Porifera: no clear symmetry attached to a surface
pores through body
no mouth or anus
example: sponges
Cnidaria:
radially symmetric
tentacles
stinging cells
mouth but no anus
example: jellyfish

9. Platyhelminths: 
bilaterally symmetrical
flat bodies
unsegmented
mouth but no anus
example: tapeworm
Annelida:
bristles often present
segmented
mouth and anus
example: earthworm

10. Mollusca:
muscular foot and mantle
shell may be present
segmentation not visible
mouth and anus
example: slugs and snails
Arthropoda:
bilaterally symmetric
exoskeleton
segmented
jointed appendages
example: spiders and insects