Download THE LEAF

SBI3U
THE LEAF
Text pp. 536-540
The function of leaves is to ____________________________________.
EXTERNAL STRUCTURE OF DICOT AND MONOCOT LEAVES
Dicot
Monocot
Fill in the table below to summarize the key similarities and differences
between dicot and monocot leaves.
Similarities
Dicot Leaves
Monocot
Leaves
INTERNAL STRUCTURE OF A LEAF
Differences
SBI3U
The External Structure of a Leaf:
Above the epidermis of a leaf is a layer called the ______________.
Its function is to ___________________ the leaf tissues and to slow down
WATER LOSS. The thin, flat blade of the leaf is attached to the stem by a
stalk called a ______________. The leaves of some plants such as corn,
lilies and irises are attached to the stem by _________.
A network of _________________ is visible on the surface of the
leaf. There are distinct differences between the vein patterns of monocot
and dicot leaves. In monocots, the main veins usually run
_________________ to one another along the length of the leaf. In dicots,
the veins form a network of ____________________. The leaves on a
stem are arranged to maximize exposure to SUNLIGHT.
Internal Structure of a Leaf:
The ______________ is a thin layer of protective tissue under the
___________. It is one ____________ thick. The cells of this layer help
to prevent water loss by being ___________ together. The cells of the
epidermis contain no _________________.
The epidermis of the leaf is covered by tiny openings called _______.
There are more stomata on the lower surface of the leaf than on the upper
surface. These special structures allow _______________ to occur.
_______ and ______ are transferred between the tissues of leaf and the
environment. _______ vapour also passes out of the leaf through the pores.
The pores are not open _______________. The stoma is surrounded by a
pair of specialized epidermal cells called _________ _________ which
______________ the opening and closing of the stoma.
Under the epidermis is a layer of tissue known as
________________. Its function is to carry out _________________.
There are two types of this tissue known as ________________ and
______________. In this layer the cells are tightly packed and filled with
_________________. The ________________ has cells with thin walls.
The lower layer, known as __________ ____________ has cells with an
irregular shape and the cells have many air spaces between them. Stoma
openings of the lower epidermis are continuous with the intracellular air
spaces of spongy mesophyll. Cells of the spongy mesophyll contain fewer
chloroplasts than cells of the palisade layer. The veins are found within the
______________ layer. The ___________ and ___________ of the leaf
veins are __________________ with that of the rest of the plant.
SBI3U
Fill in the following chart to explain how the structure of each part of
the leaf helps it to perform its function.
Name
Functions
How Structure Suits its Function
Cuticle
Epidermis
Stomate
Guard Cell
Mesophyll
-Palisade
-Spongy
Vein
SBI3U
THE LEAF
Text pp. 536-540
The function of leaves is to _maximize the surface area through which they
can absorb sunlight for photosynthesis__.
EXTERNAL STRUCTURE OF DICOT AND MONOCOT LEAVES
Dicot
Monocot
Fill in the table below to summarize the key similarities and differences
between dicot and monocot leaves.
Similarities
Differences
Dicot Leaves
Monocot
Leaves
INTERNAL STRUCTURE OF A LEAF
cuticle
epidermis (upper)
palisade mesophyll
bundle sheath
xylem
vein
phloem
epidermis (lower)
Spongy mesophyll
Guard cell
Stoma
SBI3U
The External Structure of a Leaf:
Above the epidermis of a leaf is a layer called the __cuticle_______.
Its function is to _protect_______ the leaf tissues and to slow down
WATER LOSS. The thin, flat blade of the leaf is attached to the stem by a
stalk called a _petiole_____. The leaves of some plants such as corn, lilies
and irises are attached to the stem by _a sheath________.
A network of __veins________ is visible on the surface of the leaf.
There are distinct differences between the vein patterns of monocot and
dicot leaves. In monocots, the main veins usually run __parallel__________
to one another along the length of the leaf. In dicots, the veins form a
network of ___veins_____. The leaves on a stem are arranged to maximize
exposure to SUNLIGHT.
Internal Structure of a Leaf:
The __epidermis_______ is a thin layer of protective tissue under
the __cuticle_________. It is one __cell_______ thick. The cells of this
layer help to prevent water loss by being __close___ together. The cells of
the epidermis contain no __chloroplasts_______________.
The epidermis of the leaf is covered by tiny openings called
_stoma_(singular)_. There are more stomata on the lower surface of the
leaf than on the upper surface. These special structures allow
__photosynthesis______ to occur. _Carbon dioxide_ and __oxygen____ are
transferred between the tissues of leaf and the environment. __Water___
vapour also passes out of the leaf through the pores. The pores are not open
_continuously________. The stoma is surrounded by a pair of specialized
epidermal cells called _guard____ __cells__ which __control_________
the opening and closing of the stoma.
Under the epidermis is a layer of tissue known as mesophyll_. Its
function is to carry out __photosythesis_____. There are two types of this
tissue known as __palisade_____ and _spongy___. In this layer (palisade )
the cells are tightly packed and filled with _chloroplasts________. The
___mesophyll_____________ has cells with thin walls. The lower layer,
known as __spongy _____ __mesophyll______ has cells with an irregular
shape and the cells have many air spaces between them. Stoma openings of
the lower epidermis are continuous with the intracellular air spaces of
spongy mesophyll. Cells of the spongy mesophyll contain fewer chloroplasts
than cells of the palisade layer. The veins are found within the __spongy
________ layer. The __xylem_____ and _phloem__ of the leaf veins are
____continuous______________ with that of the rest of the plant.
SBI3U
Fill in the following chart to explain how the structure of each part of
the leaf helps it to perform its function.
Name
Functions
How Structure Suits its Function
Cuticle
Epidermis
Stomate
Guard Cell
Mesophyll
-Palisade
-Spongy
Vein