The following points highlight the top eight types of stoma in the epidermis. The types are: 1. Anomocytic 2. Anisocytic 3. Paracytic 4. Diacytic 5. Actinocytic 6. The stomata are minute pores which occur in the epidermis of the plants. Stomata. Guard cells of Vicia faba. Epidermis. 2. Cruciferous or Anisocytic. Anomocytic. Stomata are with few surrounding cells which are undifferen- tiated from the normal epidermal cells (Fig. 1I). Anomotetracytic.

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A stoma appears to be embedded in epidermal cells. In this type stoma remains surrounded by three accessory or subsidiary cells of which one is distinctly smaller than the other two.

Here’s how it works: This is a question and answer forum for students, teachers and general visitors for exchanging anompcytic, answers and notes. Metcalfe and Chalk cited families where paracytic stoma is found.

The stoma is surrounded by six subsidiary cells among which two are situated on the two polar sides and rest two sfomata occur on the two lateral sides being parallel to the long axis of the guard cells. The characteristic of these guard cells is that their walls and those of the subsidiary cells are partly lignified and partly non-lignified.

Answer Now and help others. A numerical model analysis”.

In the family Rubiaceae the subsidiary cells usually meet over the poles. Stace illustrated the cyclocytic Fig. In this type, the stoma remains surrounded by two subsidiary or accessory cells which are parallel to the long axis of the pore and guard cells.


The loss of these solutes causes an increase in water potentialwhich results shomata the diffusion of water back out of the cell by osmosis. Cruciferae, Solanum, Petunia, Sedum and Nicotiana etc.

The following day, they close their stomata and release the carbon dioxide fixed the previous night into the presence of RuBisCO. This is the most common and predominant type of stomatal complex and spreads over 24 monocot families so far investigated. However, a low concentration of auxin allows for equal division of a guard mother cell and increases the chance of producing guard cells.

Ex Juncales, Graminales, Cyperales, Typhales etc. Rubiaceae, Convolvulaceae, Phaseolus, Arachis and Psoralea etc. This saturates RuBisCO with carbon dioxide, allowing minimal photorespiration. Anisocytic stoma remains surrounded by three unequally sized subsidiary cells, among which one is distinctly smaller in size than the other two. The accessory or subsidiary cells are five in number. Members of Commelinaceae, Palmae, Musaceae etc. Tilia and some members of Asclepiadaceae.

Guard cells have more chloroplasts than the other epidermal cells from which guard cells are derived.

Stomata: Definition, Types and Functions (with Diagrams) | Botany

In vascular plants the number, size and distribution of stomata varies widely. The transpiration rate is dependent on the diffusion resistance provided by the stomatal pores, and also on the humidity gradient between the leaf’s internal anomocyttic spaces and the outside air. In this type of stoma there are six subsidiary cells of which two are placed on the two polar sides and a pair on two lateral sides of the guard cells.


These scientific instruments measure the amount of water vapour leaving the leaf and the vapor pressure of the ambient air. In floating leaves Stomata are confined only on the upper surface of the leaf. Anomoccytic a result the stomatal complex has square appearance in surface view.

For natural and surgically created body openings, see Stoma medicine. Generally the term stoma is applied to the stomatal opening and the guard cells.

Stomata: Definition, Types and Functions (with Diagrams) | Botany

By using this site, you agree to the Terms of Use and Privacy Policy. This meristemoid then divides asymmetrically one to three times stojata differentiating into a guard mother cell. Views Read Edit View history.

In the face of ecological contingencies such as increasing temperatures, changes in rainfall patterns, long term climate changeand biotic influences of human management interventions, it [ clarification needed ] is expected to reduce the production and quality of food and have a negative impact on agricultural production.