IBBiologySLExam QuestionsForm & FunctionTransport

Syllabus Edition

First teaching 2023

First exams 2025

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Transport (SL IB Biology)

Exam Questions

2 hours35 questions

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1
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Which statement puts the blood vessels into increasing order of lumen diameter (interior diameter)?

  • capillary → artery → arteriole → aorta

  • arteriole → artery → capillary → aorta

  • aorta → artery → arteriole → capillary

  • capillary → arteriole → artery → aorta

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2
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Which shows the correct links between tissues within blood vessels and their modes of action?

qwY4HXgZ_e-3

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    3
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    In plants, which two substances does the xylem carry primarily?

    • Water and sugars

    • Sugars and mineral ions

    • Water and mineral ions

    • Starch and mineral ions

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    4
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    Which of the following is not a consequence of the transpiration stream in plants?

    • An increased rate of photosynthesis

    • Plants remaining upright

    • The plant retaining heat

    • Supply of mineral ions to plant tissues

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    5
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    Which row of the table best summarises the interaction of water molecules during water uptake by a plant?

      Water molecules pulling each other up Water molecules sticking to the xylem walls Capillary action
    A. cohesion adhesion adhesion
    B. cohesion cohesion adhesion
    C. adhesion adhesion cohesion
    D. cohesion cohesion cohesion

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      6
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      The micrograph below shows part of a cross section of a plant stem.

      Which of the structures A-D represents the xylem tissue?

      UZ7xGdVx_hl-ib-9-2-mcq-e-q4

      Image courtesy of Doc. RNDr. Josef Reischig, CSc. Licensed under Creative Commons Attribution-Share Alike 3.0 Unported license. Reused and distributed under conditions found at: https://creativecommons.org/licenses/by-sa/3.0/

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        1
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        The image below shows two structures commonly found in mammals. A light microscope was used to view the sample.

        screenshot-2023-07-12-at-8-55-19-pmIdentify the structures labelled X and Y along with one correct feature of these structures.

         

        		 X Y Feature
        A Vein Artery Y contains deoxygenated blood
        B Trachea Artery the lumen of X allows air to pass through
        C Artery Vein Y contains many cells filled with oxyhaemoglobin
        D Artery Vein X contains many cells filled with oxyhaemoglobin

         

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          2
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          The table gives the features of three blood vessels in the mammalian circulatory system.

          Vessel 1 Vessel 2 Vessel 3
          Thin layer of smooth muscle with few elastic fibres Thick layer of elastic fibres and smooth muscle No elastic fibres or smooth muscle

           

          What are vessels 1, 2 and 3?

            Vein Capillary Artery
          A 3 2 1
          B 1 3 2
          C 2 3 1
          D 1 2 3

           

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            3
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            Which of the following is not a contributing factor of atherosclerosis formation?

            • Damage to the endothelium of the arteries.

            • The circulation of unsaturated fats in the bloodstream.

            • High blood pressure in the arteries.

            • Build-up of atheromas under the endothelium.

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            4
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            When a very narrow glass tube known as a capillary tube is dipped into water, water can flow up the tube despite the opposing force of gravity.

            What is this model demonstrating?

            • Translocation

            • A hydrostatic pressure gradient

            • Cohesion between water molecules

            • Adhesion between water molecules

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            5
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            The following steps describe the process of transpiration.

            1. Water is drawn from xylem vessels to replace the water lost
            2. A pulling force is transmitted throughout the xylem vessels all the way down the stem of the plant and to the ends of the xylem in the roots
            3. Water evaporates from the surfaces of cells inside a leaf
            4. A low pressure is generated within the xylem

            What is the correct order of the steps?

            • III → II → IV → I

            • III → I → IV → II

            • I → III → IV → II

            • I → IV → III → II

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            6
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            Which of the following relates to xylem vessels?

            1. Transport organic compounds from source to sink
            2. Transport mineral ions from roots to leaves
            3. Provides mechanical support to the plant
            4. Closely associated with companion cells to assist with loading of sucrose

            • I only

            • II and III only

            • I, II and III

            • III and IV only

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            7
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            A student drew a diagrammatic representation of a transverse section of a plant stem based on what they saw using a light microscope.q5_9-1_transport_in_the_xylem_of_plants_ib_biology_hl_mcq

            Identify the correct labels required for the drawing above.

             

            I

            II

            III

            IV

            V
            A

            Vascular bundle

            Pith

            Phloem

            Cambium

            Xylem
            B

            Phloem

            Xylem

            Vascular bundle

            Cambium

            Pith
            C

            Vascular bundle

            Xylem

            Pith

            Cambium

            Phloem
            D

            Vascular bundle

            Cambium

            Pith

             Xylem

            Phloem

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              8
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              Girdling, or ring-barking, involves the removal of a strip of bark around the entire circumference of a tree trunk. This removes the outer part of the vascular bundles which results in the death of the entire tree over time.

              What could be a possible explanation for this?

              • Xylem is removed from the vascular bundles, so water and mineral salts cannot be transported to the leaves

              • Phloem is removed from the vascular bundles, so sugars cannot be transported to the roots

              • Xylem is removed from the vascular bundles, so sugars cannot be transported to the roots

              • Phloem is removed from the vascular bundles, so water and mineral salts cannot be transported to the leaves

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              9
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              The following photomicrograph shows the vascular bundle in a root.

              Which letter identifies the phloem?

              ma8_9-2_transport_in_the_phloem_of_plants_ib_hl_biology_mcq

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                1
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                A student studied the structure of a blood vessel and found:

                1. An innermost layer of endothelial cells
                2. A thick middle layer of smooth muscle and elastic tissue
                3. An outer layer of collagen fibres

                Which vessel was the student studying? 

                • Vein

                • Capillary

                • Venule

                • Artery

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                2
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                Which of these is not a function of plasmodesmata in plant cells?

                • To allow movement of water via the symplast pathway

                • To enable cell recognition

                • To allow communication between cells

                • To allow movement of nutrients between cells

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