Stomata& Their type

By Pankaj Kukreti

Stomata :- Stomata Denoted To Small Pore Present On Leaf , Which Are For Mean Of Gasseous Exchange & TranspirationThey Constituent Three Part-Cell Pore- Guard Cell- Subsidiary Cell

Cell Pore :-- Pore Present On Leaf - Help In Gasseous Exchange - Transpiration Occur By This

Guard Cell - Specialized Cell surrounds Stromatal Pore-Always Present In Pair- Helping Stomata In Opening & Closing

Subsidiary Cell

These Are Type Of Epidermal Cell Which Are Associated With Guard Cell They Are Morphologically Different From Guard Cell also Called Accessory Cell

Stomatal ApparatusStomatal Pore , Guard Cell & Subsidiary Cell Together Called Stomatal Apparatus

Open & Closed Stomata

>> Open Stomata Happen At Day Time Closed Stomata Happen At Night Timing>>At Open Time Transpiration Occur At Closed Timing No Transpiration Occur

Types Of Guard CellIn Dicot Leaf= Kidney Shape

In Monocot Leaf= Dum bell Shape

Arrangement Of StomataIn Monocot = Parellel

In Dicot = Irregular

Presence Of Stomata In Leaf Polygonum Type Mesophytic Type Monocot Type

Stomata Based On Ontegeny Development

Haplocheilic Type :- Guard Cell Originate By Stomatal initial & Neighbouring Cell Get Concerted Into Guard Cell

Syndetocheili Type :- Here , Guard & Subsdiary Cell Originate From Same mother Cell

Metacalfe & Chalk :- Describe 4 Type Of Dicot Stomata

Anomocytic Type :-Here , Stomata Surround With Limited Number Of Cell , Which Cannot be Differentiated From Other Cell

Anisocytic Type :-Here, Stoma Surrounds by 3 Subsdiary Cell , In Which One cell is Smaller Than Other Two

Diacytic Type :-

Here, Stomal Encloses In Pair Of Subsidiary Cell In Which They Are in At Right angle To Guard Cell

Paracytic Type :-Here Subsidairy Cell Arranged In That Manner They Having Same Arrangement As Guard Cell