IGCSEBiology: Co-ordinated Sciences (Double Award)CIEExam Questions8. Transport in PlantsTransport in Plants

Transport in Plants (CIE IGCSE Biology: Co-ordinated Sciences (Double Award))

Exam Questions

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Transport in Plants

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Transport in Plants

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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 order below is correct in describing the pathway of water as it travels from the roots through a plant?

  • Root hair cell → xylem → mesophyll cells → air spaces → stomata

  • Root hair cell → xylem → air spaces → mesophyll cells → stomata

  • Root hair cell → mesophyll cells → phloem → stomata

  • Root hair cell → mesophyll cells → xylem → stomata

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3
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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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4
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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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5
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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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A dicot plant is placed into a bowl of water coloured with red dye. 

After 1 hour, a cross section of one of the roots is cut. 

After 4 hours, a cross section is cut from the stem. 

8--q4-root-and-stem

Which labelled regions would be stained red in each case? 

  • 1 and 3

  • 1 and 4

  • 2 and 4

  • 2 and 3

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2
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Which of the following is a correct explanation of the effect of root hairs on absorption?

  • Provide a large surface area, maximising the rate of absorption of water and ions by osmosis.

  • Provide a large surface area, maximising the rate of absorption of water by osmosis and ions by active transport.

  • Increase the surface area, maximising the uptake of water by osmosis and ions by diffusion.

  • Provide a surface area, increasing the rate of absorption of water and ions by active transport.

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3
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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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4
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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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5
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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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6
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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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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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    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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      3
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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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        4
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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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          5
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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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