1
1 Diagram A is a branching key that can be used to identify different types of crustaceans.
diagram A
2
Diagram B shows six crustaceans.
Use the key in diagram A to identify the six different types of crustacean.
Write the letters on the lines in diagram B.
diagram B
[5]
[Total: 5]
3
2 The diagram shows leaves from five different species of tree.
Use the key to identify each tree species in the diagram.
Write the letter of each tree species (A, B, C, D, E) in the correct box beside the key.
1 (a) multiple narrow, needle-like leaves go to 2
(b) single leaf which is not needle-like go to 3
2 (a) leaves are evenly spread along the branch Juniperus communis
(b) leaves start from a single point Cedrus deodara
3 (a) leaf has an unlobed smooth edge Frangula alnus
(b) leaf has a lobed edge go to 4
4 (a) lobes have a smooth, rounded edge Quercus robur
(b) lobes have a jagged, irregular edge Acer pseudoplatanus
[4]
[Total: 4]
4
3 Keys can be used to identify a species.
The diagram shows drawings of six different birds and their names.
Use the key to identify the birds in the diagram.
Complete the table by writing the letters of the birds A to F in the correct box.
key letter of bird
(a) beak is longer than the head go to 2
1
(b) beak is shorter than the head go to 3
(a) beak curves upwards C
2
(b) beak does not curve upwards go to 4
(a) top part of the beak is hooked over the bottom part of the beak go to 5
3
(b) top part of the beak is not hooked over the bottom part of the beak E
(a) top part of the beak is shorter than bottom part of the A
4
(b) beak has a large projection above the beak B
(a) head has a stripe F
5
(b) head does not have a stripe D
5
name of bird in diagram letter of the bird in the key
Ammodramus bairdii
Buceros rhinoceros
Pandion haliaetus
Haliaeetus leucocephalus
Rynchops niger
Recurvirostra avosetta
[5]
[Total: 5]
4 Keys can be used to identify a species.
State the name of the type of key that uses paired choices of features.
.................................................................................................................................................. [1]
[Total: 1]
6
5 Diagram A is a dichotomous key. It can be used to identify different types of tree by using their
leaves.
diagram A
Diagram B shows leaves from six different trees.
Use the key in diagram A to identify the six different types of tree.
Write the name of each tree on the lines in diagram B.
diagram B
7
[Total: 5]
8
6 The diagram shows a key that identifies nine genera of invertebrates that have jointed legs.
Use the information in the diagram to describe two features of Musca.
1 ...............................................................................................................................................
..................................................................................................................................................
2 ...............................................................................................................................................
.................................................................................................................................................. [2]
[Total: 2]
9
7 Diagram 1 shows a key that identifies nine genera of invertebrates that have jointed legs.
diagram 1
Diagram 2 shows one of the animals described in the key.
diagram 2
Use the key in diagram 1 to identify this animal.
.................................................................................................................................................. [1]
[Total: 1]
10
8 The diagram shows five species of ciliate that are found in sewage treatment works.
11
Here is a dichotomous key to identify the ciliates shown in the diagram.
Complete the key by writing suitable statements:
• for box 2 to distinguish species B and E
• for box 4 to distinguish species A and C.
text for box 2 ............................................................................................................................
..................................................................................................................................................
..................................................................................................................................................
text for box 4.............................................................................................................................
..................................................................................................................................................
.................................................................................................................................................. [2]
[Total: 2]
12
9 The diagram shows six species of reptiles.
Use the key to identify each species. Write the letter of each species (A–F) in the correct empty
box beside the key.
13
1 (a) organism has a shell (hard covering on its back) go to 2
(b) organism does not have a shell go to 3
2 (a) organism has flat limbs (flippers) Caretta caretta
(b) organism has legs and feet Chelonoidis nigra
3 (a) organism has limbs go to 4
(b) organism has a long body and no limbs Crotalus viridis
4 (a) organism has ridges on its back go to 5
(b) organism has no ridges on its back Varanus bengalensis
5 (a) organism has a coiled tail Chamaeleo calyptratus
(b) organism has a straight tail Alligator mississippiensis
[5]
[Total: 5]
14
10 Diagram 1 shows four arthropods.
diagram 1
Diagram 2 is a dichotomous key for the arthropods shown in diagram 1.
Complete the dichotomous key by writing suitable statements in:
• box 2 to identify species B
• box 3 to separate species C and A.
diagram 2
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[2]
[Total: 2]
16
11 The ant-mimic jumping spider, Myrmarachne formicaria, is shown in the diagram.
The common name of this species describes its behaviour. It is an arachnid that tricks its prey
because it looks like the insects that it eats.
Some keys use paired choices of features to identify species such as the ant-mimic jumping spider.
State the name of this type of key.
.................................................................................................................................................. [1]
[Total: 1]
17
12 The diagram below shows five different mammals.
The diagram is not drawn to scale.
B C
D E
Use the key to identify the mammals shown in the diagram.
Write the letter of each species (A to E) in the correct box beside the key.
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key
letter
1 (a) has visible external ears go to 2
(b) does not have visible external ears Eschrichtius robustus
2 (a) stands on four legs go to 3
(b) stands on two legs go to 4
3 (a) has two horns between its ears Antidorcas marsupialis
(b) has two horns in front of its ears Diceros bicornis
4 (a) has ears placed on top of head Macropus rufus
(b) has ears placed at the side of head Homo sapiens
[4]
[Total: 4]
