Multicellular Organisms - Parts of a plant, Structure of a Leaf Flashcards
Describe the role and adaptation of the following:
* Upper Epidermis
* Lower Epidermis
upper epidermis
ROLE: Lets light through to the palisade layer below
ADAPTATION: Thin and transparent
lower epidermis
ROLE: Contains guard cells that allow the regulation of gas exchange
ADAPTATION: Thin, contains guard cells and stomata
Describe the role and adaptation of the following:
* Palisade Mesophyll
* Spongy Mesophyll
palisade mesophyll
ROLE: Contains many chloroplasts to do photosynthesis
ADAPTATION: Consists of long, thin palisade mesophyll cells packed closely together
spongy mesophyll
ROLE: Allows gases to circulate within the leaf
ADAPTATION: Contains air spaces
Describe the role and adaptation of the following:
* Vein
* Guard Cells
vein
ROLE: Xylem and phloem allow waters and sugars to be transported in and out of the leaves
ADAPTATION: Contains xylem and phloem
guard cells
ROLE: Controls the opening and closing of the stomata
ADAPTATION: They work in pairs
Describe the role of the stomata
stomata
ROLE: Site of gas exchange
ADAPTATION: Tiny pores on the leaf’s surface
Name and describe the 3 parts of a plant
- Roots - provides plant with water and minerals from the soil
- Stem - holds leaves in the correct position to absorb sunlight
- Leaves - exchanges gases in the air for photosynthesis and respiration
Describe the features of Xylem
Xylem is a tissue consisting of dead, hollowed-out cells that form a system of pipes.
The walls of xylem cells are lignified (strengthened with a substance called lignin), that allows the xylem to cope with pressure changes as water moves through the plant.
Describe the features of Phloem
Sugar produced by photosynthesis in the leaves is transported through the plant to tissues in LIVING phloem cells.
Companion cells provide the energy for the sieve cells. The end walls of the sieve cells have pores that sugar is transported through.
