Plant Structures: Leaves. What is a leaf? Leaves are structures produced on stems where photosynthesis primarily takes place. Functions: Photosynthesis Evapotranspiration (loss of water vapor from the stomata) moves water and nutrients up from the roots.
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Plant Structures: Leaves
Blade = Broad and flat part of the leaf where most of the photosynthesis
of the plant takes place.
Petiole = The thin stalk that connects the leaf to the stem.
Stipule = An outgrowth at the base of the petiole – can be in pairs;
can vary and be in the form of glands, scales, hairs, spines and sometimes
Waxy coating – prevents water loss – can be thicker in desert plants
Tightly packed parenchyma
cells filled with chloroplasts
Vascular bundle/ leaf veins - moves water and nurients through the plant
Parenchyma cells loosely
arranged, help with movement of O2, CO2 and water vapor. May contain chloroplasts
Specialized kidney shaped cells that open and close the stomata
Openings that allow for gas exchange (water vapor, O2, CO2)
Epidermis – Upper – Protect underlying tissues, could have a waxy coating to prevent water loss.
Lower – Contains stomata
Double/Doubly compound leaf