What is Stomata Class 7th

What is Stomata ?


Stomata are the tiny openings present on the epidermis of leaves and play an important role in gaseous exchange and photosynthesis.

7 Important Types of Stomata

Stomata is of following types on the basis of number and characteristics of the surrounding subsidiary cells:-

  1. Paracytic.
  2. Tetracytic.
  3. Actinocytic.
  4. Graminaceous.
  5. Anisocytic or Cruciferous.
  6. Diacytic or Caryophyllaceous.
  7. Anomocytic or Ranunculaceous.

Structure of Stomata

  • Consists of minute pores called stomata surrounded by a pair of guard cells.
  • Stomata, open and close according to the turgidity of guard cells. 
  • The cell wall surrounding the pore is flexible and tough. 
  • The shape of guard cells usually differs in both monocots and dicots. 
  • Guard cells are bean shaped, contain chlorophyll and capture light energy.
  • Subsidiary cells surround the guard cells. 

Functions of Stomata

  • Gaseous exchange between the plant and surrounding.
  • Helps in transpiration and removal of excess water in the form of water vapor.
  • Maintains the moisture balance according to weather by opening and closing.
  • Facilitates carbon dioxide uptake and release of oxygen during the process of photosynthesis.

Also Check – 8 Important Functions of the Stomata

Also Check – Mechanism of opening and Closing of the Stomata

Also Check – Stomata – Structure,  Functions ,  Location , Diagram and Types

Also Check – Stomatal Transpiration

Also Check – Exchange of Gases in Plants

Also Check – What is Guard Cells ? Definition,Location, Structure, Function and Diagram of Guard Cells

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