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 structure of a leaf with diagram and detail explaination? plz its urgent

 

Structure of a leaf:

  • A typical leaf has three main parts – lamina, petiole and leaf base.
  • The expanded and flattened part of the leaf is known as lamina.
  • Lamina contains a prominent middle vein or midrib, several veins and veinlets that form a network.
  • Petiole is the stalk of the leaf which attaches the lamina to the stem.
  • The part of the leaf which is nearest to the point of attachment with stem is called leaf base.  

 

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Leaf

Structure of a leaf: chlorophyll containing outgrowth of a stem or branch; the site of photosynthesis.
Blade (lamina): main part of the leaf.
Vein: line dividing, but not completely, the leaf into sections.
Midrib: line dividing the leaf in two.
Leafstalk (petiole): part of the leaf that is attached to the stem.
Stem: part of the plant that carries the leaves.
Sheath: part of the leaf that attaches the petiole to the stem.
Stipules: small appendage at the base of the petiole.

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thanx ishta

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thanx but i need internal structure

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Internal Features

The leaf blade is composed of several layers as follows: [Figure 1]

·  Epidermis – Outer layer of tissues

 ·  Cuticle – Waxy protective outer layer of epidermis that prevents water loss on leaves, green stems, and fruits.  The amount of cutin or wax increases with light intensity.

·  Leaf hairs – part of the epidermis

 ·  Palisade layer – A tightly packed layer of parenchyma tissues filled with chloroplasts for photosynthesis.

 ·  Chloroplasts – Sub-cellular, photosynthetic structures in leaves and other green tissues.  Chloroplasts contain chlorophyll, a green plant pigment that captures the energy in light and begins the transformation of that energy into sugars.

 

·  Vascular bundle – Xylem and phloem tissues, commonly known as leaf veins.

 ·  Spongy mesophyll – Layer of parenchyma tissues loosely arranged to facilitate movement of oxygen, carbon dioxide, and water vapor.  It also may contain some chloroplasts. 

 ·  Stomata – Natural openings in leaves and herbaceous stems that allow for gas exchange (water vapor, carbon dioxide, and oxygen).

 ·  Guard cells – Specialized kidney-shaped cells that open and close the stomata.



Figure 1.  Leaf cross section with stomata.

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These are basic diagrams

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the leaf is the cook of the plant because it prepares food for the plant.

it prepares food from the raw materials water , CO2 

in the presence of sunlight which acts as REACTION INTERMEDIATE.

the complete reaction takes place in the chlorplasts which is the REACTION CENTRE.

       REACTION INTERMEDIATE : The source of energy for carring out the reactions.

       REACTION CENYTRE         :  The place where reaction takes place.

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