Free WJEC GCSE Biology (3400) Exam Questions and Answers

Image 1.1 shows a food web from an area of grassland. Use Image 1.1 to state the organisms which are present in the highest numbers.

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Image 1.1 shows a food web from an area of grassland. Name the third stage (tertiary) consumers shown in the food web in Image 1.1. Give the reason for your choice. Name ____ Reason ____

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One food chain from the food web is shown below. The images are not to scale. grasses → insect → shrew → owl Table 1.2 shows the results of an investigation of the organisms in this food chain in the area of grassland habitat. Table 1.2 | Organism | Number of individuals counted | Mass of one individual (g) | Total biomass (g) | | shrew | 90 | 10 | ____ | | owl | 1 | 350 | ____ | | grasses | 10 000 | 2 | 20 000 | | insect | 3 000 | 4 | ____ | Complete Table 1.2 by calculating the total biomass for each of the organisms in this food chain. One has been done for you.

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One food chain from the food web is shown below. The images are not to scale. grasses → insect → shrew → owl Table 1.2 shows the results of an investigation of the organisms in this food chain in the area of grassland habitat. Table 1.2 | Organism | Number of individuals counted | Mass of one individual (g) | Total biomass (g) | | shrew | 90 | 10 | ____ | | owl | 1 | 350 | ____ | | grasses | 10 000 | 2 | 20 000 | | insect | 3 000 | 4 | ____ | Use Table 1.2 to complete the pyramid of numbers in Image 1.3 by writing the names of the organisms in this food chain and the numbers of each.

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One food chain from the food web is shown below. The images are not to scale. grasses → insect → shrew → owl Table 1.2 shows the results of an investigation of the organisms in this food chain in the area of grassland habitat. Table 1.2 | Organism | Number of individuals counted | Mass of one individual (g) | Total biomass (g) | | shrew | 90 | 10 | ____ | | owl | 1 | 350 | ____ | | grasses | 10 000 | 2 | 20 000 | | insect | 3 000 | 4 | ____ | State one way in which energy can be lost from a food chain and explain how this loss of energy is shown in the pyramid.

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Image 2.1 shows a sample of human blood as seen through a light microscope. The image labels a phagocyte and a red blood cell. The drawing in Image 2.2 shows the cell membrane of the phagocyte. Label the cytoplasm in the outline of the phagocyte.

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Image 2.1 shows a sample of human blood as seen through a light microscope. The image labels a phagocyte and a red blood cell. The drawing in Image 2.2 shows the cell membrane of the phagocyte. Measure the width x–x in mm on the drawing. Width x–x = ____ mm

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Image 2.1 shows a sample of human blood as seen through a light microscope. The image labels a phagocyte and a red blood cell. The drawing in Image 2.2 shows the cell membrane of the phagocyte. The width of the actual cell is 0.012 mm. Calculate the magnification of the drawing using the equation below. magnification = (width x–x on drawing)/(width of the actual cell) magnification = × ____

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Complete the table by selecting functions from those below. transports hormones carries oxygen defends against disease clots the blood controls temperature | Part of blood | Function | | red blood cell | ____ | | white blood cell | ____ | | platelets | ____ |

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There are many types of blood cell, each with a particular function. They all come from one type of cell found in bone marrow through the process of differentiation. This is shown in Image 2.3. Choose the letter A-D to give the term used for the various types of blood cells.

• AA. selected
• BB. specialised
• CC. secondary
• DD. sensitive