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Leaves and Transport

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Katelynn Dorn

on 30 April 2014

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Transcript of Leaves and Transport

Simple leaf and compound leaf with leaflets
Blade- thin, flattened section of leaf
Petiole- attaches leaf to stem
cuticle and epidermal cells form a layer to protect against water loss
vascular tissue in leaves connects to vascular tissue in stems
vascular bundles in leaf blade are surrounded by parenchyma and sclerenchyma cells
Leaf Structure
Water Transport
Capillary Action
cohesion- H20 molecules form H bonds w/ each other
adhesion- attraction between unlike molecules
capillary action- tendency of water to rise in a thin tube
Transpirational Pull
movement of water out of leaves pulls the water in rest of plant upward
Controlling Transpiration
when water pressure rises, stomata open
when water pressure drops, guard cells close stomata
Wilting- in hot, dry conditions, plant loses water and osmotic pressure
Nutrient Transport
Phloem pushes sugars from leaves to fruits
pressure-flow hypothesis
- sugars pumped into phloem (source), water moves in from xylem, takes sugars to storage (sink)
Leaf Functions
Photosynthesis
mesophyll- ground tissue where photosynthesis occurs
carbohydrates produced here are carried by phloem
palisade mesophyll- absorbs light
spongy mesophyll- air-filled, contains stomata and guard cells
Transpiration- loss of water through leaves
Gas Exchange
take in CO2 and give off O2 during photosynthesis
take in O2 and give off CO2 during respiration
stomata open and close due to change in water pressure in guard cells
stomata open during day, close at night and in hot, dry conditions
Leaves and Transport
Ch. 23-4/5
How do
different leaves
survive?
Review
What is the difference between a simple leaf and a compound leaf?

Describe the layers of palisade mesophyll and spongy mesophyll.

How do guard cells regulate the opening and closing of stomata?

What is the purpose of sapwood?

How do plants exchange gases in
respiration?
Lab Questions
In which stalk did the colored water rise the most? The least?
What effect did the petroleum jelly have on respiration? What part of the leaf did the petroleum jelly effect?
How are leaves involved in transpiration?
What type of ground tissue cells make up the strings of celery?
Full transcript