1 1 Which structures are present in a bacterial cell? cell wall nucleus A ✓ ✓ B ✓ ✗ C ✗ ✓ D ✗ ✗ [1] [Total: 1] 2 All commercial breeds of sheep belong to the species Ovis aries. Define the term species. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. .................................................................................................................................................. [2] [Total: 2] 3 The diagram below shows the nematode, Caenorhabditis elegans. 2 (a) State the genus of this nematode. ........................................................................................................................................... [1] 3 (b) Nematodes feed on dead and decaying material. Explain why this gives nematodes an important role in ecosystems. ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... [3] [Total: 4] 4 Myriapods are a group of arthropods that are commonly found in soil habitats in many parts of the world. Many myriapods are very small and not easy to identify. The diagram below shows four species of myriapod, not drawn to the same scale. Polydesmus denticulatus Cylindroiulus punctatus Scutigera coleoptrata Scolopocryptops sexspinosus 4 (a) State three features of all myriapods that are visible in the myriapods above. 1......................................................................................................................................... ........................................................................................................................................... ........................................................................................................................................... 2......................................................................................................................................... ........................................................................................................................................... 3......................................................................................................................................... [3] (b) Describe three features of myriapods that could be used to make a dichotomous key to distinguish between the four species shown above. 1......................................................................................................................................... ........................................................................................................................................... 2......................................................................................................................................... ........................................................................................................................................... 3......................................................................................................................................... ........................................................................................................................................... [3] [Total: 6] 5 All living organisms show the same seven characteristics. State four of the characteristics of living organisms. 1 ............................................................................................................................................... 2 ............................................................................................................................................... 3 ............................................................................................................................................... 4 ............................................................................................................................................... [4] [Total: 4] 5 6 The diagram shows six different arthropods labelled A, B, C, D, E and F. State the letter of the organism in the diagram that is a crustacean. Give a reason for your answer. letter ......................................................................................................................................... reason ...................................................................................................................................... .................................................................................................................................................. [2] [Total: 2] 6 7 The diagram below shows five molluscs. They all live in the sea or on the shore. C A B E D Use this key to identify these molluscs. 1 2 3 4 Shell has one part Go to 2 Shell has two parts C. edule Shell has a hole in the top F. aperta Shell does not have a hole in the top Go to 3 Shell is narrow, with an obvious point C. australis Shell is rounded with no obvious point Go to 4 Shell is plain, with no pattern L. Littorea Shell is patterned T. regina Write your answers in the Table below. mollusc name A B C D E [4] [Total: 4] 7 8 To which group do both the organisms shown in the diagram belong? leaf-like fronds which have structures containing spores on their lower surface A dicotyledons B ferns C fungi D monocotyledons [1] [Total: 1] 9 The table shows the scientific names of four members of the cat family. common name scientific name leopard Panthera pardus lion Panthera leo ocelot Leopardus pardalis tiger Panthera tigris Which statement is correct? A All four cats are members of the same species. B The leopard and the ocelot are members of the same genus. C The leopard, lion and tiger are members of the same genus. D The leopard, lion and tiger are members of the same species. [1] [Total: 1]
