1. The Structure and Function of
Xylem and Phloem
(c) describe, with the aid of diagrams and
photographs, the structure and function of xylem
vessels, sieve tube elements and companion cells;

3. Vascular bundle...

7. Notes pgs 70-71...
• Compare the function, what is transported,
what part of the plant they are found in, any
additional functions, their structure, and the
nature of the tissue (alive or dead)
• (c) describe, with the aid of diagrams and
photographs, the structure and function of
xylem vessels, sieve tube elements and
companion cells;
Answer qus 1-5 pg 71 AS OCR

8. Improve this chart
Function:
Phloem
Transportation of food and
nutrients from leaves to
storage organs and
growing parts of plant.
Xylem
Water and mineral
transport from roots to
aerial parts of the plant.
Movement:
Bidirectional (Moves up or
Unidirectional (Moves up
down the plant's stem
the plant's stem)
from "source to sink")
Occurrence:
Roots, stems and leaves
Roots, stems and leaves
Forms vascular bundles
with phloem and gives
mechanical strength to
plant due to presence of
lignified cells.
Tubular with hard walled
cells
Additional Functions:
Forms vascular bundles
with xylem
Structure:
Tubular with soft walled
cells
Elements:
Sieve tubes, companion
cells, phloem parenchyma, Xylem vessels , xylem
intermediary cells, two
parenchyma
tube flow
Nature of tissue:
Living tissue
Non living tissue at
maturity

9. Summary...
• The vascular tissue in a leaf forms a network of bundles
that finally merge to form one central (1) which runs
into the stalk of the leaf that is also called the (2). The
vascular tissue found nearest to the upper surface of
the leaf is (3). In stems, the vascular tissue nearest the
outside of the stem is (4). Inside this tissue is a layer of
dividing tissue called (5) and outside it there is often a
region of supporting tissue called (6). The vascular
tissue in stems forms a cylinder towards the outer edge
as this arrangement best resists the (7) forces that
stems are subjected to. In roots, the vascular tissue is
central in order to resist the (8) forces experienced by
the roots.

10. Missing words…
1.
2.
3.
4.
5.
6.
7.
8.
Vein
Midrib
Xylem
Phloem
Cambium (meristem)
Parenchyma
Shearing/bending
Pulling