write the structure of leaf?
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There are many types of leaves such as, according to venation, simple leaves, compound leaves, pinnate leaves and plamate leaves.
Structure of the leaf? Here we go.
A leaf consists of three parts- leaf Base, petiole and lamina.
Lamina (also known as epipodium) or leaf blade is the terminal thin, expanded, green and conspicuous part of the lag which is actually specialised to perform an important process called photosynthesis. The flattened Lamina or leaf blade is supported by veins and veinlets which contain vascular tissues for conduction of water, mineral salts and prepared food (such as starch).
There are two surfaces on each- adaxial (ventral, and upper part) towards the upper part of the stem and abaxial (dorsal, lower part) towards the lower part of the stem. The two surfaces are quite distinct to each other in dorsiventral leaves (most of them are dicot leaves) but are quite similar in isobilateral leaves (most of them are of this type, monocot leaves).
Petiole (known as mesopodium) is a cylindrical or subcylindrical part which is smooth or grooved stalk of the leaf which lifts the Lamina above the level of the stem so as to provide it with a maximum exposure to the leaf (crucial for light intensity). Leaf having a large petiole is called as petiolate. It is termed so, sessile if the petiole is actually not present (absent in the nature).
Leaf Base (also known as hypopodium) is the lowermost part of the leaf by which the leaf is joined to the node of the stem. It protects and facilitates the young axillary bud (growing from axile of the plant). Leaf Base is often indistinguishable from the petiole itself. In many leguminous plants it is swollen. The swollen leaf Base is known as pulvinus. It is responsible for sleep and shock movements of certain leaves, e.g., Mimosa pudica. Leaf Base may be broadened to enclose it's stem. It is called sheathing leaf Base. The latter two of its types- amplexicaul (enclosing stem completely as in grasses, wheat) and semi-amplexicaul (enclosing the stem in a particular partial way, e.g., Buttercup). Leaf Base often contain two small lateral outgrowths called stipules. A leaf with stipule is called as stipulate while the one without stipules is termed as exstipulate.
In grasses an outgrowth is present between the leaf Base and the lamina. It is called ligule. The leaf with ligule is called ligulate.
NOTE: Because of the character limit coming into the action, the total characters or words are exceedingly high. Please post a new question regarding stipules for further information.
Structure of the leaf? Here we go.
A leaf consists of three parts- leaf Base, petiole and lamina.
Lamina (also known as epipodium) or leaf blade is the terminal thin, expanded, green and conspicuous part of the lag which is actually specialised to perform an important process called photosynthesis. The flattened Lamina or leaf blade is supported by veins and veinlets which contain vascular tissues for conduction of water, mineral salts and prepared food (such as starch).
There are two surfaces on each- adaxial (ventral, and upper part) towards the upper part of the stem and abaxial (dorsal, lower part) towards the lower part of the stem. The two surfaces are quite distinct to each other in dorsiventral leaves (most of them are dicot leaves) but are quite similar in isobilateral leaves (most of them are of this type, monocot leaves).
Petiole (known as mesopodium) is a cylindrical or subcylindrical part which is smooth or grooved stalk of the leaf which lifts the Lamina above the level of the stem so as to provide it with a maximum exposure to the leaf (crucial for light intensity). Leaf having a large petiole is called as petiolate. It is termed so, sessile if the petiole is actually not present (absent in the nature).
Leaf Base (also known as hypopodium) is the lowermost part of the leaf by which the leaf is joined to the node of the stem. It protects and facilitates the young axillary bud (growing from axile of the plant). Leaf Base is often indistinguishable from the petiole itself. In many leguminous plants it is swollen. The swollen leaf Base is known as pulvinus. It is responsible for sleep and shock movements of certain leaves, e.g., Mimosa pudica. Leaf Base may be broadened to enclose it's stem. It is called sheathing leaf Base. The latter two of its types- amplexicaul (enclosing stem completely as in grasses, wheat) and semi-amplexicaul (enclosing the stem in a particular partial way, e.g., Buttercup). Leaf Base often contain two small lateral outgrowths called stipules. A leaf with stipule is called as stipulate while the one without stipules is termed as exstipulate.
In grasses an outgrowth is present between the leaf Base and the lamina. It is called ligule. The leaf with ligule is called ligulate.
NOTE: Because of the character limit coming into the action, the total characters or words are exceedingly high. Please post a new question regarding stipules for further information.
Rinshu131:
thank u
To the moderators: Before taking any action on the reported question reconsider the parts and the structure of the leaf which actually include all this. If you still dispute it as incorrect or trivial I shall contact the administration and put the point of the view.
no your answer is right.
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leaf structure are having like phyllotaxis in phylogenetic type
no both answer is wrong....
but thank for help
but thank your help
its wrong and bye
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