Organisation Plants Flashcards
What is the epidermal tissue
This covers the whole plant
What is the palisade mesophyll tissue
Part of the leaf where most photosynthesis happens
What is spongy mesophyll tissue
Contains big air spaces to allow gasses to diffuse in and out of cell
What is the meristem tissue
Found at growing tips of shoots and roots and is able to differentiate
How does the structure of the tissues of the leaf relate to their functions
Epidermal tissue -coverd waxy cuticle (minimise water loss)
Upper epidermis-transparent(light pas through)
Palisade layer-lots of chloroplasts
Tissues of leaves are adapted for efficacy gas exchange
What way does the leaf organ made up
Epidermal tissue
Palisade mesophyll
Spongy mesophyll
Epidermal tissue
Properties of phloem
Made of columns of elongated cells with small pores in the end
Transport food substances
Transport goes in both directions
Procces called translocation
Properties of xylem
Made of dead cells joined end to end with no end walls
Carry water and mineral ions from roots to stem&leaves
What is transpiration
Loss of water from plants
What is transpiration caused by
Evaporation and diffusion
What is the transportation rate affected by
Light intensity
Temperature
Airflow
Humidity
How does light intenisty affect transpiration
Brighter light -greater transpiration rate
Stomata close as it gets darker -due to photosynthesis not happening in dark
When closed very little water can escape
How does temp affect transpiration
Warmer it is -faster transpiration
When warm,water particles have more energy to evap and diffuse out of stomata
How does air flow affect transpiration
Better air flow better transpiration
If good air flow water vapour is swept away
How does humidity affect transpiration
Dryer leaf -more transpiration
If humidity is high diffusion can’t happen
