6. Plant nutrition
A section of Biology, 0610
Listing 10 of 508 questions
shows a spongy mesophyll cell from the leaf of a plant. The arrows show the net direction of movement of carbon dioxide molecules during daylight. A B C D E F G 0.01 mm The scale bar in represents 0.01 mm. Convert 0.01 mm to micrometres. μm Table 1.1 shows: • the functions of some of the structures in plant cells • some of the names of the structures where these functions occur • some of the letters that label these structures in . Complete Table 1.1. Table 1.1 function structure letter in nucleus chloroplast aerobic respiration contains cell sap and stores water A Carbon dioxide is a raw material for photosynthesis. State the process by which carbon dioxide travels into the leaf from the air. Describe the pathway taken by a molecule of carbon dioxide, from the air outside a leaf to a spongy mesophyll cell. Low concentrations of carbon dioxide in the air may restrict the rate of photosynthesis in plants. State the term given to something present in the environment in such short supply that it restricts life processes. State one other feature of the environment that may also restrict the rate of photosynthesis. Researchers have devised a process of artificial photosynthesis. They use gold nanoparticles as a catalyst to utilise green light to convert carbon dioxide to fuels, such as propane. Suggest the advantages to the environment of using artificial photosynthesis on a large scale.
0610_s22_qp_42
THEORY
2022
Paper 4, Variant 2
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Some algae are single‑celled organisms that can photosynthesise. Their cells contain the pigment chlorophyll. State the name of one mineral ion that is needed to make chlorophyll. A student investigated the effect of light on photosynthesis in algae, using hydrogencarbonate indicator solution. Carbon dioxide is an acidic gas. Table 4.1 shows the colour of the hydrogencarbonate indicator solution at different pH values. Table 4.1 pH 7.6 8.4 9.2 colour of indicator yellow red purple Two test‑tubes were set up at the same time. Both contained algae and hydrogencarbonate indicator. At the start of the investigation the hydrogencarbonate indicator was red in both test‑tubes. One test‑tube was placed in the dark and one test‑tube was placed in the light. After 20 minutes, the contents of the test‑tube in the dark were yellow and the contents of the test‑tube in the light were purple. Explain these results. is a graph showing the effect of light intensity on the rate of photosynthesis. X Y light intensity rate of photosynthesis State which factors could be limiting the rate of photosynthesis at X and at Y in . , , Starch and sucrose are made by plants after photosynthesis. State the name of the tissue that transports sucrose around the plant and the name of one other biological molecule that is transported in this structure. tissue biological molecule Describe how starch is broken down in the human digestive system so that it can be absorbed into the blood. , ,
0610_s24_qp_42
THEORY
2024
Paper 4, Variant 2
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Use Which form of the Sun’s energy is used by plants? Name the process that uses this absorbed energy. The graph, , shows how the concentration of carbon dioxide in the atmosphere has changed over a period of about 20 years. 6 7 9 10 time / year carbon dioxide concentration / parts per million 11 12 13 14 15 16 17 18 19 20 Describe the changes shown by this graph. The atmosphere around the earth acts as a trap for energy from the Sun. Carbon dioxide in the air traps heat energy. Suggest the effect the overall change in the graph, , may be having on the Earth’s climate. Explain your answer. Effect Explanation Examiner's Use Humans cause changes in ecosystems, including changing the amount of carbon dioxide in the atmosphere. Suggest two ways in which the overall change can be reversed.
0610_w05_qp_2
THEORY
2005
Paper 2, Variant 0
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For Examiner's Use shows a section through a leaf. A leaf is designed for photosynthesis and this process provides a supply of simple sugars for a plant. chloroplast spongy mesophyll cells stoma State the function of the chloroplasts in photosynthesis. Describe and explain the advantage of the distribution of the chloroplasts as shown in . Suggest the function of the stomata and the spaces between the spongy mesophyll cells in the process of photosynthesis. For Examiner's Use Name the tissue that transports the sugars made by photosynthesis to other parts of the plant. Name the mineral ion that is used to form proteins.
0610_w06_qp_2
THEORY
2006
Paper 2, Variant 0
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Questions Discovered
508