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

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Plant structures leaves

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)


Plant structures leaves

External structure:


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

look leaf-like.


Plant structures leaves

Internal structure:


Plant structures leaves

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


Plant structures leaves

Simple leaf

Blade

Double/Doubly compound leaf

Compound leaf

Leaflets

Leaflet


Plant structures leaves

Simple leaf

Compound leaf

Doubly compound

leaf


Plant structures leaves

Pinnate

venation


Plant structures leaves

Alternate

Whorled

Opposite


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