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7.1. Structure of transport tissues
A subsection of Biology, 9700, through 7. Transport in plants
Listing 10 of 147 questions
Every reasonable effort has been made to trace all copyright holders where the publishers (i.e. UCLES) are aware that third-party material has been reproduced. The publishers would be pleased to hear from anyone whose rights they have unwittingly infringed. University of Cambridge International Examinations is part of the University of Cambridge Local Examinations Syndicate (UCLES), which is itself a department of the University of Cambridge. 40 Leguminous plants have root nodules containing bacteria. The diagram shows a transverse section through part of the root and root nodule of a leguminous plant. What is indicated by the labels 1, 2, 3 and 4?
9700_w05_qp_1
MCQ
2005
Paper 1, Variant 0
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Use shows a transverse section of a root nodule of a legume. is a drawing of a cell from the centre of the nodule made from an electron micrograph. cell from centre of nodule mitochondrion cortex bacteria – each within a membrane Name three structures that are present in cells in the cortex of the root that are not present in bacterial cells. Examiner’s Use Explain the advantages of studying cell structure with an electron microscope rather than with a light microscope. Describe the role of Rhizobium in the root nodule. Cells in the centre of the root nodule have a high concentration of the pigment, leghaemoglobin. This combines with oxygen in much the same way as haemoglobin in mammals. Leghaemoglobin is responsible for maintaining anaerobic conditions around the bacteria in the nodules. Leghaemoglobin is not found in the roots of other plants. The base sequence in the gene that codes for the β polypeptide of mammalian haemoglobin is similar to that for leghaemoglobin. Suggest why this is so.
9700_w06_qp_2
THEORY
2006
Paper 2, Variant 0
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In an investigation, discs of 2.5 cm diameter were cut from leaves. Fifty discs were put into three identical bags with different net sizes and buried in newly dug soil at a depth of 3 cm. At 60 day intervals the bags were dug up and the leaf discs measured to see how much of the leaf area had disappeared. The table shows the percentage of leaf discs remaining in each bag. percentage of leaf disks remaining time / days net size 7 mm net size 0.5 mm net size 0.03 mm Which organisms are most important for breaking down the leaves?
9700_w09_qp_11
MCQ
2009
Paper 1, Variant 1
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In an investigation, discs of 2.5 cm diameter were cut from leaves. Fifty discs were put into three identical bags with different net sizes and buried in newly dug soil at a depth of 3 cm. At 60 day intervals the bags were dug up and the leaf discs measured to see how much of the leaf area had disappeared. The table shows the percentage of leaf discs remaining in each bag. percentage of leaf disks remaining time / days net size 7 mm net size 0.5 mm net size 0.03 mm Which organisms are most important for breaking down the leaves?
9700_w09_qp_12
MCQ
2009
Paper 1, Variant 2
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Questions Discovered
147