Biology 9700 · AS & A Level
Structure of transport tissues
99 practice questions on Structure of transport tissues, with worked solutions and instant marking.
The diagrams illustrate transverse sections of parts of a plant. Which labelled structures are responsible for transporting mineral ions?
Feb/March 2017
Which features of lignin are important for the role of xylem vessels in the stem of a tall plant, such as a tree?
Feb/March 2019
Which statements are true of phloem sieve tube elements and of xylem vessel elements?
Feb/March 2021
Every meristem cell in a leaf bud can enlarge and divide by mitosis to form two daughter cells that are genetically identical to one another and to the cell that divided originally. Fig. 5.1 shows the stages in the mitotic cell cycle of a meristem cell.
Feb/March 2021
The diagram illustrates the relationship between phloem sieve tube elements, xylem vessel elements and companion cells. Which row correctly shows what the numbers 1, 2, 3, 4 and 5 could stand for?
Feb/March 2022
The bar charts indicate the amounts of endothelial tissue, elastic tissue and muscle tissue present in the walls of three blood vessels, P, Q and R. Which row correctly names the three blood vessels?
Feb/March 2022
Which row gives the correct pairing of the structure and function of phloem sieve tube elements?
Feb/March 2023
Which statement accurately describes the relationship between a companion cell and its sieve tube cell?
Feb/March 2024
Fig. 3.1 presents a photomicrograph of part of a transverse section through the root of an iris, $\textit{Iris germanica}$. Irises are herbaceous monocotyledons. These plants contain the same transport tissues as herbaceous dicotyledons, but the arrangement of the transport tissues is different. In monocotyledons, the central region of the root is parenchyma (packing tissue).
Feb/March 2024
The diagrams show transverse sections of the stem, root and leaf of a non-woody dicotyledonous plant. The arrangement of the tissues is indicated in each section. Which sequence of numbers correctly shows how xylem and phloem are distributed in the stem, root and leaf?
May/June 2010
The diagrams show transverse sections of the stem, root and leaf of a non-woody dicotyledonous plant. In each section, the arrangement of the tissues is illustrated. Which sequence of numbers correctly shows the arrangement of xylem and phloem in the stem, root and leaf?
May/June 2010
Which row correctly shows how the structure of an artery differs from that of a vein when viewed in transverse section under a light microscope?
May/June 2011
Which plant cells lack a nucleus? 1. Companion cells 2. Sieve tube elements 3. Xylem vessel elements
May/June 2013
Fig. 2.1 presents xylem tissue in longitudinal section of the stem of a dicotyledonous plant.
May/June 2013
The photomicrograph depicts a vascular bundle taken from a plant stem. Which labels are correct for structures X, Y and Z?
May/June 2014
The diagrams illustrate some tissue types in plant organs. Which row identifies the tissue types?
May/June 2014
Which characteristics are shared by sieve tube elements and xylem vessel elements?
May/June 2014
The diagram presents transverse sections of two plant structures. Which row gives the correct labels?
May/June 2015
The diagram illustrates a vascular bundle from the stem of a plant. Which row identifies the functions of the labelled cells?
May/June 2015
Fig. 4.1 shows an electron micrograph of a transverse section through the stem of Asian rice, Oryza sativa.
May/June 2016
The diagrams show cross-sections through three plant organs. Which row is the correct one for phloem?
May/June 2017
Which row correctly describes a phloem sieve tube element?
May/June 2017
Which characteristics of companion cells are necessary for their function?
May/June 2018
The diagrams display transverse sections of parts of a plant. Which structures, labelled 1 to 4, are responsible for transporting water and sucrose?
May/June 2018
Which diagram accurately shows part of a sieve tube element?
May/June 2018
Some features found in transport tissues of plants are given. Which of these features occur in phloem sieve tube elements?
May/June 2019
The diagram illustrates how phloem sieve tube elements, xylem vessel elements and companion cells are related. Which row is correct?
May/June 2019
Which statement is correct about phloem sieve tube elements?
May/June 2019
The diagrams illustrate transverse sections of parts of a plant. Transport tissues are marked 1 to 6. Which combination identifies the tissues whose main role is the transport of water?
May/June 2019
Meristematic tissue occurs in the growing parts of plants, for example the shoot tips. Meristematic cells perform a role comparable to stem cells in animals. Fig. 4.1 shows several stages in the development of a mature phloem sieve tube element and companion cells from a meristematic cell.
May/June 2019
Fig. 1.1 is a low-power photomicrograph showing part of the common sunflower, Helianthus annuus. Fig. 1.1 shows a transverse section.
May/June 2019
Phloem sieve tube elements and xylem vessel elements are plant cells involved in transporting substances.
May/June 2019
The photomicrograph depicts a transverse section of a leaf. Which xerophytic leaf features can be seen in this section?
May/June 2020
The diagrams illustrate transverse sections of parts of plants. Which labelled region has cells that are dead?
May/June 2020
The diagram illustrates how tissues are arranged in part of a transverse section of a plant organ. Which row correctly names tissues 1, 2 and 3?
May/June 2020
The diagram shows a cross-section of a stem. Which region is the phloem?
May/June 2021
Which statements about how xylem vessel elements are adapted to their function are correct?
May/June 2021
Sugars move through phloem sieve tubes from a source, for example a mature leaf, to a young leaf that functions as a sink. That young leaf also requires water and dissolved mineral ions, and these are delivered to it in xylem vessels.
May/June 2021
Phloem sap is carried inside phloem sieve tubes.
May/June 2021
The diagram illustrates a plant organ. Which letter correctly identifies the xylem?
May/June 2022
The photomicrograph shows a vascular bundle in a plant organ. Which of the following statements about this vascular bundle are correct?
May/June 2022
Which row gives the correct explanation of how the structures of phloem sieve tube elements and xylem vessel elements are linked to their roles as transport systems?
May/June 2023
The electron micrograph displays a longitudinal section through part of a plant stem. What is the name of the structure labelled X?
May/June 2024
What substance causes xylem vessel walls to be impermeable to water?
May/June 2024
The diagram illustrates a transverse section of transport tissue in a plant. Which row correctly identifies cell 1 and cell 2?
May/June 2024
Which substances in xylem tissue are not permeable to water and stop the vessels from collapsing?
May/June 2024
The electron micrograph illustrates a longitudinal section through phloem tissue. Which student’s drawing of a sieve tube element is drawn and labelled correctly?
May/June 2024
Lignin and suberin are polymers found in plant tissues.
May/June 2024
Which characteristics of companion cells and xylem vessel elements enable them to carry out their functions effectively?
May/June 2025
The photomicrograph shows a slice of vascular tissue taken from the stem of a plant. Which statement about this photomicrograph is correct?
May/June 2025
Which features are found in both companion cells and phloem sieve tube elements?
May/June 2025
Ranunculus is a genus of dicotyledonous plants with more than 1600 species.
May/June 2025
In plant roots, specialised tissues develop from a zone at the root tip called the root apical meristem. Fig. 1.1 illustrates the different regions of a root tip.
May/June 2025
Which diagram shows the correct arrangement of mature xylem vessel elements and phloem elements?
Oct/Nov 2010
The diagram depicts a transverse section through a stem. Which region is the phloem?
Oct/Nov 2010
Which diagram correctly represents the structure of mature xylem vessel elements and phloem sieve tube elements?
Oct/Nov 2010
Cellulose is a polysaccharide. Fig. 5.1 depicts three sub-units taken from one cellulose molecule.
Oct/Nov 2010
The diagram illustrates a longitudinal section of transport tissue in a plant stem. What are the names of element X and the tissue in which it occurs?
Oct/Nov 2011
Four students were each asked to propose a set of four labels for a plan diagram showing a transverse section of a dicotyledonous leaf. Which student, A, B, C or D, proposed the correct set of labels?
Oct/Nov 2012
Which row correctly recognises xylem vessel elements and sieve tube elements?
Oct/Nov 2012
The diagrams display transverse sections of parts of a plant (leaf, stem and root). In the transverse sections, what do 1, 2, 3, 4, 5 and 6 represent?
Oct/Nov 2012
Which option correctly pairs the structure with the function of sieve tube elements?
Oct/Nov 2012
Which characteristic of xylem vessel elements enables them to offer less resistance to movement?
Oct/Nov 2013
What structural feature of xylem vessel elements enables them to remain open as the rate of transpiration rises?
Oct/Nov 2013
Explain why transport systems are needed in plants.
Oct/Nov 2013
What is the chief role of a companion cell in phloem tissue?
Oct/Nov 2014
The diagram illustrates a transverse section through a stem. Which region is the phloem?
Oct/Nov 2014
The diagram illustrates how phloem sieve tube elements, xylem vessel elements and companion cells are related. Which statement is correct?
Oct/Nov 2014
Which plan diagram of a transverse section through a dicotyledonous leaf shows the xylem and phloem in the correct positions when the palisade mesophyll layer is twice as thick as the spongy mesophyll layer?
Oct/Nov 2014
Which description best describes xylem vessel elements?
Oct/Nov 2016
The diagrams display transverse sections of three plant parts: leaf, stem and root. In these transverse sections, which tissues move water and which tissues move sucrose?
Oct/Nov 2016
Plants possess two transport tissues: xylem and phloem.
Oct/Nov 2017
The photomicrographs show the root, stem and leaf of a dicotyledonous plant. Which row gives the correct labels for 1 to 5 on the photomicrographs?
Oct/Nov 2018
Which features are shared by phloem sieve tube elements and xylem vessel elements?
Oct/Nov 2018
Four students were asked to propose a set of four labels to add to a diagrammatic plan of a transverse section of a dicotyledonous leaf. Which student proposed a correct set of labels?
Oct/Nov 2018
Photomicrograph X displays a transverse section of a typical stem. Photomicrograph Y displays a longitudinal section of one kind of cell shown in photomicrograph X. Which letter shows the cells from photomicrograph Y?
Oct/Nov 2018
The diagrams illustrate several tissue types found in plant organs. Which row correctly identifies the tissue types?
Oct/Nov 2019
Which row gives the correct description of the adaptations of companion cells, phloem sieve tube elements and xylem vessel elements for their roles?
Oct/Nov 2019
Which features play a part in the transport of water through xylem vessel elements?
Oct/Nov 2019
Which row identifies why xylem vessels do not contain cytoplasm?
Oct/Nov 2019
Fig. 1.1 is a photomicrograph showing a transverse section of the stem of creeping buttercup, Ranunculus repens.
Oct/Nov 2019
The photograph shows a part of a stem. Which labelled part is xylem?
Oct/Nov 2020
What characteristics help water to move through xylem vessel elements?
Oct/Nov 2020
Some features of transport tissues in plants are given below. Which of these features occur in xylem vessel elements?
Oct/Nov 2020
Leaf veins contain transport tissues. Fig. 2.1 is a drawing based on an electron micrograph of a transverse section through the transport tissue in a leaf vein. The cells labelled A are altered companion cells called phloem transfer cells. Transfer cells move sucrose and other assimilates from mesophyll cells, B, into the phloem sieve tube element, C.
Oct/Nov 2020
The table summarises a student’s observations of three cell types, P, Q and R, taken from a transverse section through a plant stem and viewed using a light microscope. P: ratio of cell wall width to whole cell width = $1:10$, structures seen in cell contents = none Q: ratio of cell wall width to whole cell width = $1:20$, structures seen in cell contents = regular pattern of circles in some cells R: ratio of cell wall width to whole cell width = $1:20$, structures seen in cell contents = granular appearance of all cells What kind of cells are P, Q and R?
Oct/Nov 2021
Which characteristics of companion cells are vital for their role?
Oct/Nov 2021
The diagram illustrates a vascular bundle taken from a plant stem. Which row gives the functions of the labelled cells?
Oct/Nov 2021
Several features found in the transport tissues of plants are given below: 1. lignified walls 2. cytoplasm 3. mitochondria 4. chloroplasts 5. plasmodesmata Which of these features are found in sieve tube elements?
Oct/Nov 2021
The diagrams illustrate some tissue types in plant organs. Which row correctly identifies the tissue types?
Oct/Nov 2022
Which statement gives the correct description of xylem vessel elements?
Oct/Nov 2022
In the electron micrograph, a lengthwise section of part of a plant stem is shown. Identify X.
Oct/Nov 2022
A student produced the plan diagram of a transverse section through a dicotyledonous plant stem. The section had been treated with a chemical that stains lignin. Which row shows the correct tissues W and Z?
Oct/Nov 2023
Of the statements about xylem vessel elements, which one is correct?
Oct/Nov 2023
Plants contain specialised cells that transport assimilates efficiently.
Oct/Nov 2023
Water taken up from the soil solution by a plant's roots moves into xylem vessels and is then carried to the leaves and buds. Fig. 6.1 illustrates four key conditions needed for water to move efficiently from the roots up to the leaves of a plant.
Oct/Nov 2023
Xylem vessel elements are cells specialised for the movement of water. Which statement correctly pairs an adaptation of a xylem vessel element with its function?
Oct/Nov 2024
A plant called a mesophyte is adapted to live where water stress is usually absent because water is not normally scarce.
Oct/Nov 2025
Blood is carried towards the heart in veins. A vein’s structure is suited to the job it performs.
Oct/Nov 2025