B2 - Classification

Question 1

What are the kingdom divisions down to species?

Answer 1

Koalas play crochet on fluffy ground sometimes.

Kingdom, phylum, class, order, family, genus, species.

Question 2

What are the 5 kingdoms?

Answer 2

Animals, plants, fungi, protoctista, prokaryotes

Question 3

What are the 4 classes of the arthropods and what are their characteristics ?

Answer 3

Myriapods (e.g millipedes and centipedes )

• long, segmented body
• each body segment has legs

Crustacea ( e.g crabs and woodlice )

• body covered in hard outer coating
• ten legs

Arachnids ( e.g spiders and scorpions)

• body divided into two sections
• eight legs

Insects ( e.g bees and butterflies )

• body divided into three sections
• six legs
• usually two pairs of wings

Question 4

What are the two systems biologists use to classify organisms?

Answer 4

Natural - based on evolutionary links, so organisms are grouped together if they have common ancestry.

Artificial – based on visible features, making a group of organisms easier to identify.

Question 5

What are the problems with classification?

Answer 5

• may share characteristics from two groups.
• large range of organisms, and many organisms are quite similar.
• sometimes individuals from two closely related species can breed together. This type of offspring is called a hybrid.
• There are many species of bacteria, and they do not reproduce with one another. They reproduce asexually. Biologists still classify them as different species, based on their characteristics.
• Evolution means that organisms are slowly changing. They can eventually become new species.

Question 6

Define species.

Answer 6

A species is a group of similar organisms that are capable of interbreeding to produce fertile offspring.

Question 7

What is the binomial naming system?

Answer 7

Two part name
First = genus
Second = species