6 marksFig. 1 is a branching key used to identify different species of bacteria.
Fig. 1
Fig. 2 shows six different species of bacteria.
Fig. 2
(i) Use the key to identify the six different species of bacteria.
[5]
(ii) State the name of the kingdom that bacteria belong to.
[1]
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The scientific name for humans is Homo sapiens.
State the level of classification referred to by each part of the scientific name:
Homo……..
Sapiens……
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3 marksThe animal in Fig. 1 is a chimpanzee.
Fig. 1
(i) The chimpanzee is a vertebrate.
State the main group of vertebrates to which the chimpanzee belongs.
[1]
(ii) State two features, visible in Fig. 1, which suggest that it belongs to this group of vertebrates.
[2]
2 marksThe binomial system of naming species gives chimpanzees the name Pan troglodytes.
Describe what is meant by the binomial system of naming species.
1 markChimpanzees are classified taxonomically as a single species, Pan troglodytes.
Define what is meant by the term species.
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1 markThe organisms shown in Fig. 1 are a group of invertebrates called arachnids.
Fig. 1
Describe the common features of arachnids visible in Fig. 1.
5 marksUse the key shown below to identify the arachnids shown in Fig. 1
.
1 | a | Has a tail structure | Scorpiones |
b | Does not have a tail structure | go to 2 | |
2 | a | Has large pair of front pincers | Pseudoscorpiones |
b | Does not have large front pincers | go to 3 | |
3 | a | Legs are at least three times as long as the body | Pholcidae |
b | Legs are similar or smaller in length than the body | go to 4 | |
4 | a | Legs have visible spines/hairs | Lycosidae |
b | Legs do not have visible spines/hair | Ixodida |
2 marksDichotomous keys can be used to help classify organisms.
Explain the purpose of classification systems.
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3 marksDichotomous keys can be used to identify organisms based on a series of questions about their features.
Fig. 1 shows a group of leaves.
Fig. 1
Suggest a dichotomous key for the leaves shown in Fig. 1 by completing Table 1. An example has been done for you.
Table 1
| statement | answer / instruction | |
1 | a | leaf is oval shaped | beech |
| b | leaf is not oval shaped | go to 2 |
2 | a |
|
|
| b |
|
|
3 | a |
|
|
| b |
|
|
4 marksFig. 2 shows a different type of dichotomous key where invertebrates are classified.
Fig. 2
Complete the dichotomous key to show the classification of arthropods into their four sub groups.
4 marksFig. 3 shows a range of different plants.
Fig. 3
(i) Give the type of plant, (monocotyledons, dicotyledons or ferns) for each plant labelled A-F.
[3]
(ii) Describe the evidence shown in Fig. 3 that informed your answer for plant F.
[1]
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