Question

Draw the diagram of an open stomatal pore and label (I) Guard cells, and (II) Chloroplast on it. Mention two functions performed by stomata.

Answer 1

Step 1: Diagram Description:
An open stomatal pore typically looks like a small slit or opening between two curved bean-shaped cells. These two cells are called guard cells.
Inside the guard cells, several small green structures called chloroplasts are present.

Labels to include on the diagram:
(I) Guard cells – the two bean-shaped cells that control the opening and closing of the stomatal pore.
(II) Chloroplast – small green organelles found inside the guard cells responsible for photosynthesis.

Step 2: Two main functions of stomata:
1. Gaseous Exchange: Stomata allow the exchange of gases (oxygen and carbon dioxide) between the plant and the atmosphere during photosynthesis and respiration.
2. Transpiration: Stomata help in the loss of excess water in the form of water vapor, which is known as transpiration. This also helps in cooling the plant and pulling water from the roots.

Conclusion:
The open stomatal pore is bordered by two guard cells containing chloroplasts. The stomata perform important functions like gas exchange and transpiration.

Diagram of an Open Stomatal Pore: