0610_w20_qp_32
A paper of Biology, 0610
Questions:
8
Year:
2020
Paper:
3
Variant:
2

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shows a food web. snake bird spider frog dragonfly aphid flowering plant tree beetle caterpillar Complete Table 5.1 using the information in . One has been done for you. Table 5.1 number shown in producers herbivores primary consumers carnivores State the name of one organism in which obtains its energy from eating three different organisms. A disease killed most of the snakes in the food web in . Complete the sentences by circling the correct words in bold. The first one has been done for you. The population of snakes increases / decreases / stays the same . The population of spiders increases / decreases / stays the same because there is less predation / food / competition . The population of caterpillars increases / decreases / stays the same because there is more predation / food / competition . Decomposers are not shown in the food web in . Complete the definition of the term decomposer. A decomposer is an organism that gets its from dead or waste material. shows a food chain. cabbage caterpillar bird Table 5.2 shows the number of organisms in this food chain and some of the information needed to draw a pyramid of numbers. Table 5.2 organism number of organisms width of bar in pyramid / mm bird caterpillar cabbage Complete Table 5.2 by calculating the missing value and writing it in the table. Complete the pyramid of numbers on the grid for the food chain shown in using the information in Table 5.2. The bar for the cabbage has been done for you. Label the organisms on the pyramid of numbers.
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Plants carry out photosynthesis. State the names of two substances produced by photosynthesis. A student investigated how temperature affects the rate of photosynthesis. The concentration of carbon dioxide was kept constant during the investigation. The results are shown in . temperature rate of photosynthesis Predict how the rate of photosynthesis will change when carbon dioxide concentration increases and the temperature is kept constant at 20 °C. State one factor other than temperature and carbon dioxide concentration that will affect the rate of photosynthesis. In another investigation students used a plant which had variegated leaves. One of the leaves from this plant is shown in . B green: chloroplasts present A white: chloroplasts absent Complete Table 8.1 to show where the processes of photosynthesis and respiration occurred in this variegated leaf when the plant was in the light. Place a tick (3) in each correct box. Table 8.1 process area A area B photosynthesis respiration Cells in the mesophyll layers of a leaf carry out photosynthesis. State the names of two leaf layers that light must pass through to reach the spongy mesophyll cells. Plants absorb mineral ions from the soil. State the name of the tissue that transports mineral ions in plants. State the name of the mineral ion that is used to make chlorophyll. State the name of the mineral ion that is used to make amino acids. Plants are involved in nutrient cycles in ecosystems. Describe the role of plants in the carbon cycle and the water cycle.