Structure of transport tissues: past paper questions
Real questions on structure of transport tissues
The newest 20 of 162 written questions. Open one to see it on the real paper.
- 9700/21 · October/November 2025 · Q5a(i)[1]
Name one substance transported in T in Fig. 5.1.
See it on the paper → - 9700/21 · October/November 2025 · Q5a(ii)[1]
State the name of the substance that forms the spiral thickening around the structure labelled T in Fig. 5.1.
See it on the paper → - 9700/21 · October/November 2025 · Q5b(i)[3]
Suggest explanations for the relationship between leaf temperature and the rate of transpiration of T. aestivum as shown in Table 5.1.
See it on the paper → - 9700/21 · October/November 2025 · Q5b(ii)[1]
Suggest one difference between the structure of the leaves of T. aestivum and the leaves of G. hirsutum that could explain the results shown in Table 5.1.
See it on the paper → - 9700/42 · October/November 2025 · Q3a(i)[3]
With reference to Fig. 3.1, suggest and explain how the presence of glucose in the extracellular environment prevents lactose entering the bacterial cell.
See it on the paper → - 9700/42 · October/November 2025 · Q3a(ii)[2]
Suggest the advantages for the bacterial cell in preventing the entry of lactose when glucose is present in the extracellular environment.
See it on the paper → - 9700/42 · October/November 2025 · Q3b(i)[2]
With reference to Fig. 3.2, describe the effect of the different diets on the percentage of E. coli that are lac + .
See it on the paper → - 9700/42 · October/November 2025 · Q3b(ii)[2]
The scientists concluded that lac + E. coli had a selective advantage when colonising the gut, but only in the presence of lactose. Suggest why the presence of lactose caused lac + E. coli to have a selective advantage.
See it on the paper → - 9700/42 · October/November 2025 · Q5a[4]
Genomic DNA and primers are added to the PCR machine. Name two other substances that are added to the PCR machine, and explain why each substance is added.
See it on the paper → - 9700/42 · October/November 2025 · Q5b(i)[2]
Suggest the role of the DNA ladder. (i)
See it on the paper → - 9700/22 · May/June 2025 · Q3e[2]
Carrot virus Y is a pathogen of carrot plants. The virus, which belongs to a group known as Potyvirus, replicates its viral nucleic acid and proteins within host carrot cells. The general structure of potyviruses is shown in Fig. 3.2. capsid RNA Fig. 3.2 The synthesis of viral proteins in host carrot cells only involve...
See it on the paper → - 9700/22 · May/June 2025 · Q5b[3]
Suggest and explain the advantages of using bone marrow stem cells from the blood sample to manufacture artificial red blood cells.
See it on the paper → - 9700/22 · May/June 2025 · Q5c[3]
One desirable feature of artificial blood products, such as artificial red blood cells, is that they should be economical to produce. Suggest other desirable features of artificial blood products.
See it on the paper → - 9700/23 · May/June 2025 · Q1a(i)[2]
Name the cells labelled A and B in Fig. 1.1. A
See it on the paper → - 9700/23 · May/June 2025 · Q1a(ii)[1]
The procambium tissue shown in Fig. 1.1 consists of stem cells. Suggest a role of the procambium tissue in the roots of this plant.
See it on the paper → - 9700/23 · May/June 2025 · Q1b[4]
Some species in the Ranunculus genus are xerophytes. State and explain two adaptations of the leaves of xerophytic plants that reduce water loss. adaptation explanation adaptation explanation
See it on the paper → - 9700/22 · October/November 2024 · Q1c[1]
Phloem is the plant tissue responsible for the transport of organic substances, such as fatty acids, from one area of a plant to another. The tissue is composed of more than one type of cell. Name the type of cell that forms the transport vessels of phloem tissue.
See it on the paper → - 9700/22 · October/November 2024 · Q6a[4]
Describe the transport of water from the soil solution to the endodermis of roots by the apoplast pathway and explain why this pathway cannot continue at the endodermis.
See it on the paper → - 9700/22 · October/November 2024 · Q6b[3]
Researchers investigated the mechanism of transport used for the uptake of potassium ions (K + ) into root epidermal cells at different concentrations of K + in the soil solution. Complete Table 6.1 to provide information about the two different transport mechanisms that were identified by the researchers. Table 6.1 ne...
See it on the paper → - 9700/23 · October/November 2024 · Q6b(ii)[1]
With reference to Fig. 6.1, state why choleragen molecules are described as having quaternary structure.
See it on the paper →
What examiners said
Some candidates used the data in Table 3.1 effectively to identify cell type A as a sieve tube element. A common incorrect answer was to identify the cell as a prokaryote cell although the question clearly stated that the cells were found in plant tissue and must therefore be eukaryotic cells. Some candidates incorrectly identified the cell as being found in xylem tissue. Candidates who were able...
— Examiner report, October/November 2023, 9700/21 Q3(a) (Cambridge)
Xylem vessel elements were known by a number of candidates. Otherwise, a wide range of incorrect names were seen. These commonly included lignified cells, sclerenchyma, xylem tube cells, xylem cells, dead cells, sieve tube elements, tracheids and mesophyll cells.
— Examiner report, October/November 2023, 9700/22 Q6(a) (Cambridge)
Good answers to this question included the terms ‘source’ and ‘sink’ so that the explanations were clear and credit could be awarded. Many explanations of the source were confused with the role of xylem and stated that water and mineral ions are absorbed by roots and provided to the rest of the plant. The question made it clear that it was about the transport of assimilates, which in this context...
— Examiner report, October/November 2023, 9700/23 Q5(a)(i) (Cambridge)
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