Topic 2 E Flashcards
Layers of leaf
Epidermal
Palisade mesophyll tissue
Spongy mesophyll tissue
Xylem and phloem
Stomata
Guard cell
What does epidermal do
Transparent so light can pass through
What does the palisade do
Lots of chloroplast for photosynthesis
What does spongy do
Air spaces for gas to diffuse
Xylem and phloem
Transport water , minerals and food
Stomata
Gass exchange
Guard cell
Controll how much gets in and out
Phloem
Food
Both directions ( translocation)
Xylem
Water
From roots to leaves ( transpiration)
What is transpiration
Loss of water from plant
What is transpiration caused by
Evaporation
Diffusion
What effects rate of transpiration
Light intensity
Temperature
Air flow
Humidity
How can you estimate the rate of transpiration
Measure the uptake of water
When do stomata open and close
Open when lots of water in leaf
Closes when less water in leaf to stop water vapour escaping
