O LevelBiologyCambridgeExam Questions7. Transport in Flowering Plants7.2 Transpiration & Translocation

Transpiration & Translocation (Cambridge O Level Biology)

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7.2 Transpiration & Translocation

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7.2 Transpiration & Translocation

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1
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The diagram below shows a potted plant and the same plant 48 hours later.

8-q1-wilting

What has caused the plant’s appearance to change?

  • Water loss by translocation is greater than water uptake.

  • Water evaporating from the leaves by translocation.

  • Water loss by transpiration is greater than water uptake.

  • Water loss from the leaves by osmosis.

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2
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Which of the following is a correct explanation of the process of translocation in a plant?

  • The movement of mineral ions through the xylem of a plant.

  • The movement of sucrose and amino acids through the phloem from a source to a sink.

  • The one-way movement of sucrose and amino acids through the phloem.

  • The movement of sucrose and amino acids through the phloem from a sink to a source.

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3
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The diagram shows a simplified water cycle.

q11-organisms-and-their-environment-mcq-booklet-1-cie-igcse-biology

Which of the processes listed below would be involved in the loss of water from the tree?

  • Respiration

  • Translocation

  • Photosynthesis

  • Evaporation

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4
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A potometer can be used to measure the rate that a piece of plant transpires under various conditions. 

Part of a potometer is shown in the diagram below. 

potometer

Which statement, relating to how a potometer works, is false?

  • A potometer uses the transpiration stream to produce movement of an air bubble that can be measured. 

  • In a potometer, an air bubble moves away from the piece of plant tissue that is under investigation. 

  • In order to determine the rate of transpiration, the movement of the bubble must be measured alongside the time taken. 

  • The leaves of the plant in the potometer must be dry during the experiment. 

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1
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Which of the following processes is/are involved in the loss of water from the leaves of plants?

  1. diffusion
  2. osmosis
  3. condensation
  4. evaporation

  • 1 and 3

  • 1 only

  • 4 only

  • 1 and 4

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2
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A student collected some of the solution from the phloem in the stem of a plant. 

Which of the following would be present in the liquid?

  • Glucose

  • Starch

  • Amino acids

  • Cellulose

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3
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A decrease in which of the following factors would normally cause the transpiration rate to increase?

  • Stomatal density

  • Light intensity

  • Temperature

  • Humidity

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4
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Which environmental factor is most likely to be responsible for a plant to wilt?

  • A decrease in light intensity.

  • An increase in humidity.

  • A decrease in the amount of available water.

  • A decrease in wind speed.

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51 mark

The diagram shows the pathway of water molecules through part of a leaf, seen under a microscope, in a transverse section. 

Where does water evaporate?q6-7-2-transpiration-translocation-medium-mcq-cie-o-level-biology 

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    61 mark

    Which row shows how the rate of transpiration changes when conditions in the atmosphere change?

      reduced wind increased humidity
    A decreases decreases
    B decreases increases
    C increases decreases
    D increases increases

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      1
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      The diagram below shows part of the trunk of a small dicotyledonous tree with a ring of bark removed.

      Removing the ring of bark removes one type of transport tissue but leaves the other type intact.

      8--q5--phloem

      What effect does removing the bark have on the two branches?

        upper branch lower branch
      leaves growth leaves

      growth
      A normal normal normal reduced
      B wilted normal wilted normal
      C wilted reduced normal normal
      D normal reduced wilted reduced

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        2
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        The xylem has specific adaptations to allow it to transport water and mineral ions from the roots of a plant to the leaves as a result of transpiration.

        Which processes produce the adaptations in xylem vessels to allow the continuous flow of water?

         

        cell walls break down between adjacent cells 

        cytoplasm and organelles removed from each cell

        A

        		 ✘ ✘

        B

        		 ✓ ✓

        C

        		 ✘ ✓

        D

        		 ✓ ✘

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          3
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          Which of the following graphs shows most clearly what would happen to the rate of transpiration as humidity decreases?

          8--q9--rate-and-humidity

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            4
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            The diagram below shows two shoots at the start of an experiment set up by a group of students.

            8--q11--transpiration-

            What are the most likely readings on the spring balances after four days?

              Spring balance readings / g
            shoot A shoot B
            A 40 40
            B 40 34
            C 34 40
            D 34 34

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              5
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              The table below shows some characteristics of four different plants. 

              The plants are growing in the same environmental conditions. 

              Which plant will have the lowest rate of transpiration?

               

              number of leaves on plant

              average surface area of one leaf / cm2

              average density of stomata on leaves / stomata per mm2

              average diameter of one stoma / µm
              A 36 53 276 19
              B 21 51 247 18
              C 24 45 249 15
              D 17 40 151 16

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                6
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                Which row of the table below shows substances transported through the phloem and xylem, and the direction of transport, correctly?

                  phloem direction of transport xylem direction of transport
                A sucrose and amino acids bi-directional (up and down) water and mineral ions bi-directional (up and down)
                B sucrose unidirectional (up) water and mineral ions bi-directional (up and down)
                C sucrose bi-directional (up and down) water  unidirectional (up)
                D sucrose and amino acids unidirectional (up) water  unidirectional (up)

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