Exam-Style Questions: Classification

1. a) Define the following terms:

(i) Species.

(ii) Genus.

b) (i) Who devised the binomial system for naming organisms?

(ii) Why is this system useful for classification?

(Marks available: 4)

Answer

Answer outline and marking scheme for question: 1

Give yourself marks for mentioning any of the points below:

a) (i) All members of a species are capable of interbreeding to produce fertile offspring. A species will have a particular set of characteristics.

(ii) A genus is a group of similar or closely related species.

(2 marks)

b) (i) Carl von Linne/Linnaeus.

(ii) Closely related species are grouped together.

Latin is used so there is no language barrier, the organism only has one 'true' name.

(2 marks)

(Marks available: 4)

2. Define the following terms:

a) (i) Diploblastic.

(ii) Triploblastic.

b) Name two advantages that having a coelom gives an organism.

(Marks available: 4)

Answer

Answer outline and marking scheme for question: 2

Give yourself marks for mentioning any of the points below:

a) (i) An animal possessing 2 major tissue layers. These include the outer layer (the ectoderm) and the inner layer (the endoderm).

(ii) An animal possessing 3 major tissue layers. It has a middle layer (the mesoderm), between the endoderm and the ectoderm.

(2 marks)

b) Choose from:

It enables independent movement of the gut wall and the body wall.

It provides space of the enlargement and development of internal organs.

It may act as a circulatory medium for transport of materials or a storage area of excess or waste materials.

(2 marks)

(Marks available: 4)

3. a) What is phylogenetic classification?

b) List the five kingdoms and give an example of the type of organism belonging to each kingdom.

(Marks available: 6)

Answer

Answer outline and marking scheme for question: 3

Give yourself marks for mentioning any of the points below:

a) A system of classification that reflects the evolution of organisms.

(1 mark)

b) Monera: Bacteria/cyanobacteria

Protoctista: Algae/protozoa.

Fungi: Mould/yeast/mushrooms

Plantae: Angiosperms/ferns/conifers

Animalia: Sponges/flatworms/mammals

(5 marks)

(Marks available: 6)