Year 9 Photosynthesis – Structures of a Leaf (Homework)
No
Structure
Description
1
Functions
Waterproof – preventing the wetting of the leaf and
reflecting excess heat away
2
Epidermis
3
Palisade Mesophyll
4
Regular cells tightly bound – upper and lower
epidermis
Contains loose oval cells in the lower part of leaf
with lots of air spaces
For gas exchange
For gas exchange
5
Air space
Air space found in spongy mesophyll
6
Xylem
Tubes in the vascular bundle at the lower position
7
8
Name: __________________________________
For transport of sugar made in photosynthesis
Guard cell
9




Stomata
Spongy Mesophyll
Cuticle
Phloem
Pores found mainly in the lower epidermis
For exchange of gases and water vapour







Waxy layer on the top of epidermis
Contains elongated (rectangular) cells with lots
of chloroplasts) at the upper part of the leaf
2 kidney-shaped cell with chloroplasts found in
lower epidermis
Tubes in the vascular bundle at the upper
position

Forming a stoma for exchange of gases
Main site for photosynthesis
Protecting the leaf from mechanical damage and
infection.
For transport of water and mineral salts from the
root to the leaf
Use these words to label the diagram of a leaf : vein, petiole, mid-rib, blade
For the internal structure of a leaf: guard cells, cuticle, vascular bundle, spongy mesophyll, , palisade mesophyll
For the next 2 diagram on the right:
Stoma, chloroplast, guard cell,
epidermis cell, cytoplasm, nucleus
Photosynthesis process: glucose, carbon dioxide, oxygen, sunlight, oxygen, water, chlorophyll