Leaves (Morphology and Anatomy of other leaf types. (Succulent leaves (…
Morphology and Anatomy of other leaf types.
Succulent leaves ( they are thick and fleshy, cylindrical or spherical in shape ex, Agave).
Sclerophyllous Foliage Leaves ( tends to be soft, flexible and edible, examples barberry, holly).
Leaves of Conifers ( leaves are sclerophylls, thick cuticle, simple leaves, needle shaped)
Leaves with Kranz Anatomy ( occurs in plants that have a special metabolism called C4 photosynthesis).
Insect Traps ( pitcher leaves is passive trap anad leaves of sundew is active trap).
External structure of Foliage Leaves
It's main function is Photosynthesis.
Leaf blade, also called Lamina.
Simple leaf (has a blade of just one part).
Compound leaf ( has a blade divided into several individual parts).
Petiole ( It holds the blade out into the light and prevents shading of leaf blades).
Veins ( bundles of vascular tissues).
Reticulate venation (netted pattern).
Occurs in basal angiosperms and eudicots.
Parallel venation ( runs side by side with few obvious interconnections)
occurs in monocot plants
Internal structure of Foliage leaves.
It helps in transpiration which is the loss of water.
Mesophyll ( These are ground tissues interior to the leaf epidermis).
Contains Palisade parenchyma, a photosynthetic tissue in upper portion.
Lower portion contains spongy mesophyll with open, loose arenchyma which permits diffusion of carbondioxide.
Vascular tissues ( These are between palisade parenchyma and spongy mesophyll.
minor veins ( helps in releasing water from xylem and loading sugar into phloem)
Many fibers arranged in a sheath, called bundle sheath.
Initiation and development of leaves.
Basal Angiosperms and eudicots
Their leaves are produced only through the activity of a shoot apical meristem.
For example, mango, peanut, peas etc.
Leaves are initiated by the expansion of some shoot apical meristem cells to form a leaf primordium.
For example, rice , wheat, maize etc.