3. Movement into and out of cells
A section of Biology, 5090
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Some plants can survive extreme dehydration for a long time in a dormant state. They start growing again when water is available. They are adapted to survive in deserts. Selaginella lepidophylla is an example of this type of plant. shows a S. lepidophylla plant after several months without water and the same plant three days after rainfall. several months without water three days after rainfall plant is a brown colour plant is a green colour Explain how the changes in the plant, shown in , will help it to start growing again after rainfall. shows the cell wall and nucleus of a cell from this plant after several months without water. Suggest and explain the appearance of other parts of this cell after several months without water. You may draw on to help you answer. Selaginella lepidophylla is the scientific name for the plant species, which also has the common name ‘resurrection moss’. Explain what is meant by the term species. State the name of the scientific system used to name the species and suggest one advantage of using the scientific name rather than the common name. name of system advantage
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THEORY
2024
Paper 2, Variant 1
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Flowering plants are sometimes grown in soil to provide cut flowers that can then be displayed. A gardener watered flowering plants with a fertiliser solution containing dissolved chemicals. Table 6.1 shows the information printed on the label of the container of fertiliser powder used to prepare this fertiliser solution. Table 6.1 chemical component mass / g per 100 g fertiliser powder nitrates 4.0 phosphates 4.0 sulfur 1.0 magnesium 0.5 To prepare the fertiliser solution, the gardener dissolved 20 g of the fertiliser powder in 10 dm3 of water. Calculate the total mass of sulfur in the fertiliser solution prepared by the gardener. Space for working. Explain which chemical component of the fertiliser solution is the most important to plants for: making the leaves of the plants green in colour the production of enzymes by cells in the leaves of the plants. The chemical components of the fertiliser solution are absorbed by the root hair cells of the plants and are then transported to the leaves. Complete the words below to name the three main tissues in the pathway taken by the chemical components of the fertiliser solution from the root hair cells to the leaves. The first letter of each word has been completed for you. C X M When flowers from the plants are cut and used for display, the leaves are removed before each stem is placed in water. A solution containing sucrose is often added to this water. Sucrose is not needed in fertiliser solution used to water plants growing in soil. Explain the benefit of providing sucrose to cut flowers.
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THEORY
2024
Paper 2, Variant 2
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Questions Discovered
170