Chapter 6
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What’s the main function of leaves?
Manufacturing food Exchange gasses Transpiration Evaporation Store food
Why does plants manufacture of food?
help the plant to produce food converting the energy in sunlight into chemical energy plant can make glucose during photosynthesis.
How does the plant exchange gases?
Openings, stomata, helps exchange gasses. Day - CO2 in, O2 out Night - O2 in, CO2 out
What is the purpose of transpiration and evaporation?
Helps pull water from roots. Help cooling the plant
How do leaves store food?
In form of starch
Of what dat the basic dicotyledonous leaf consist?
Leaf base Two stipules Petiole auxiliary bud Leaf blade
Leaf base?
Expanded area of petiole where leaf attaches to stem.
Paired stipules?
Located each side of leaf base. Two small flaps protect young blade as develops.
Petiole?
Stalk connects blade to leaf base Inside tiny vessels, connected with veins in leaf
Blade?
Major photosynthetic surface of plant, appears green.
Veins?
Visible in leaf blade are vascular bundles for transport of organic molecules and inorganic substances.
What are organic molecules?
Sucrose Amino acids
What are inorganic substances?
Water Mineral ions
Auxiliary bud?
Develops in axil between petiole and stem. Potential to form shoots or flowers.
What is a simple leaf?
When only single blade inserted directly on petiole.
What is a compound leaf?
Blade two or more subunits: leaflets
What are the different layers of the leaf?
Upper epidermis Lower epidermis Mesophyll Vascular bundles
Upper epidermis?
Layer transparent cells-cover up surface of leaf Allows light to pass through mesophyll cells Protect inner cells Produce cuticle
What is the cuticle?
Waxy layer - cover upper epidermis
Lower epidermis?
Layer Transparent cells - cover lower surface leaf Reduces water evaporation Allow light pass through mesophyll cells Protect inner cells Sometimes produce cuticle Stomata
Stomata?
Between epidermal cells Guard cells on each side Control opening and closing Gaseous exchange CO2 and O2 diffuse in and out Transpiration Few chloroplasts some photosynthesis
Mesophyll?
Between two epidermises Top - palisade: most photosynthesis takes place Bottom - spongy m: round, loosely arranged; air spaces between for gaseous exchange by diffusion between m cells and air. Photosynthesis also takes place
Vascular bundles?
Xylem Phloem
Xylem?
Tiny tubes - xylem vessels Transport inorganic substances