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CAIE A-Level Biology AS 7.1 Structure of Transport Tissues Questions

Practise plant-transport tissue questions by reading dicot root, stem and leaf sections, then linking xylem and phloem cell structure to function.

Syllabus
2028–2030
Course
Biology 9700
Level
AS

Exam points

  • identify xylem and phloem distribution in root, stem and leaf transverse sections
  • label xylem vessel elements, sieve tube elements, companion cells and sieve plates
  • link lignin, hollow vessels, pits and companion cells to water or assimilate transport

Covered syllabus points

7.1.1—Plan diagrams of transverse sections7.1.2—Xylem and phloem distribution7.1.3—Xylem and phloem cell drawings7.1.4—Structure and function

Question 1

[Maximum number: 1]
A

dicotyledonous leaf has a palisade mesophyll layer that is approximately twice as thick as the spongy mesophyll layer.

Which plan diagram is correct?
A
upper surface of leaf

Figure for Question 1 — CAIE A-Level Biology AS
Figure for Question 1 — CAIE A-Level Biology AS
C

upper surface
of leaf

Figure for Question 1 — CAIE A-Level Biology AS
D

upper surface
of leaf

Figure for Question 1 — CAIE A-Level Biology AS

Question 2

[Maximum number: 1]

Water and mineral ions are transported up the stem of a plant to the leaves within xylem vessels.
Some water and mineral ions can pass out of xylem vessel elements to supply parenchyma tissue in the stem.

Fig. 1.1 is a plan diagram of a section through a stem.

Fig. 1.1

Fig. 1.1

Identify one location where xylem tissue occurs in the stem by drawing a label line and the letter X on Fig. 1.1.

Question 3

[Maximum number: 1]

Nerium oleander is a xerophytic plant. A photomicrograph of a section through the leaf of N. oleander is shown in Fig. 3.1.

Fig. 3.1

Fig. 3.1

Name the cells specialised for the transport of assimilates in N. oleander.

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