Plant Structures:   Leaves
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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

  • 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.

  • Small openings in the leaf (stomata) regulate moisture

  • and gas exchange and temperature in the plant.

  • Used for feed and food.

  • Habitat for some organisms

  • Used for plant identification

  • Used for asexual reproduction (cuttings)



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

look leaf-like.



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


Simple leaf desert plants

Blade

Double/Doubly compound leaf

Compound leaf

Leaflets

Leaflet


Simple leaf desert plants

Compound leaf

Doubly compound

leaf


Pinnate desert plants

venation


Alternate desert plants

Whorled

Opposite


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