Exterior structures of plants Flashcards
1
Q
Stomata -
- Found?
- Consists of?
A
- Gas exchange and transpiration
- Found in the epidermis of all above ground organs, but are characteristic to the leaves
- Guard cells - Open and closes forming a pore through which the gas exchange takes place
- Accessory/subsidiary cells
2
Q
Non-secretory trichomes
A
- Reduce transpiration
- Deter herbivores
- Reflect UV light
- Retain water
- Attach seeds or fruits to animal fur as a mean of dispersal
3
Q
Periderm
A
Cork cambium
4
Q
Cork cambium produces….
- outer
- inner
A
- outer layers of cork cells impregnated with suberin
- phelloderm, a living parenchyma cell, caused by the inward pushing of cells
5
Q
How does bark develop?
A
- New periderm develops usually at the interior of another
- Outer layer begins to break
- Bark = exfoliating periderms
6
Q
What do latificers secrete? Why?
A
- Latex (usually toxic, anti-herbiovory strategy)
- Plant is cut or damaged
7
Q
Resin ducts are…
Where?
A
- Canals lined with secretory cells that release resin into a canal
- Entire body of the conifer plant
8
Q
Gum ducts secrete?
Used in reference to?
A
- Resins, oils and gums
- Eudicots
9
Q
Use of gum and resin
A
Antibacterial protects plants in case of mechanical injury
10
Q
Nectaries produce?
Associated w/?
A
Sugar-based secretions
Associated w/ flowers and they reward pollinators
11
Q
Extrafloral nectaries
A
Form on other organs other than flowers
