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6.1. Photosynthesis
A subsection of Biology, 0610, through 6. Plant nutrition
Listing 10 of 307 questions
For Examiner's Use shows variegated (green and white) leaves on a destarched plant. Part of one of the leaves was covered. leaf cover green area white area The plant was left in bright light for 24 hours and then the cover was removed from the leaf. The leaf was tested for the presence of starch. leaf with cover removed green area white area original position of cover L K M N Suggest which areas of the leaf, as shown in , would have contained starch after 24 hours. Table 3.1 area contains starch key K …………………………  = starch present L ………………………… x = starch absent M ………………………… N ………………………… Record your suggestions in Table 3.1. For Examiner's Use Give reasons for your suggestions for areas K and L. area K area L Starch is formed from a simple carbohydrate. Name the process, carried out by plants, that produces this simple carbohydrate. State which gas is released from the leaf when this simple carbohydrate is being produced. Magnesium ions are needed to form the green pigment in the leaf. State where magnesium ions enter a plant. Suggest how magnesium ions enter a plant.
0610_s12_qp_22
THEORY
2012
Paper 2, Variant 2
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For Examiner's Use shows variegated (green and white) leaves on a destarched plant. Part of one of the leaves was covered. leaf cover green area white area The plant was left in bright light for 24 hours and then the cover was removed from the leaf. The leaf was tested for the presence of starch. leaf with cover removed green area white area original position of cover L K M N Suggest which areas of the leaf, as shown in , would have contained starch after 24 hours. Table 3.1 area contains starch key K …………………………  = starch present L ………………………… x = starch absent M ………………………… N ………………………… Record your suggestions in Table 3.1. For Examiner's Use Give reasons for your suggestions for areas K and L. area K area L Starch is formed from a simple carbohydrate. Name the process, carried out by plants, that produces this simple carbohydrate. State which gas is released from the leaf when this simple carbohydrate is being produced. Magnesium ions are needed to form the green pigment in the leaf. State where magnesium ions enter a plant. Suggest how magnesium ions enter a plant.
0610_s12_qp_23
THEORY
2012
Paper 2, Variant 3
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For Examiner's Use Fanwort, Cabomba caroliniana, is an aquatic plant often used to provide oxygen in fish tanks. Some students investigated the effect of temperature on the rate of photosynthesis of C. caroliniana. The apparatus that they used is shown in . ruler oil droplet capillary tubing water with sodium hydrogencarbonate beaker of water Cabomba caroliniana thermometer bench lamp stopwatch Explain why: the lamp was kept at the same distance from the C. caroliniana throughout the investigation; the water was enriched with carbon dioxide by adding sodium hydrogencarbonate. For Examiner's Use The students determined the rate of photosynthesis by measuring the movement of the oil droplet along the glass tubing. Their results are shown in Table 2.1. Table 2.1 distance travelled by the droplet / mm per minute temperature / °C mean 3.7 12.0 15.0 20.0 40.0 4.3 0.7 Describe the effect of temperature on the rate of photosynthesis of C. caroliniana. For Examiner's Use Photosynthesis is a chemical process catalysed by enzymes. Explain how the results shown in Table 2.1 support the idea that enzymes are involved in photosynthesis. C. caroliniana originally grew only in Latin America. This plant has escaped into the wild in Australia where its rapid growth has reduced the biodiversity of many streams and rivers. Suggest why the growth of C. caroliniana in Australia is far greater than in Latin America.
0610_s13_qp_33
THEORY
2013
Paper 3, Variant 3
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Questions Discovered
307