Structure of Stomata
Stomata are composed of two specialized cells called guard cells, which surround a pore. The guard cells are responsible for regulating the opening and closing of the stomatal pore.Function of Stomata
1. Gas Exchange: Stomata allow for the exchange of gases, such as carbon dioxide and oxygen, between the plant and the surrounding atmosphere. 2. Transpiration: The opening and closing of stomata control the rate of transpiration, which is the process of water evaporation from the plant's surface.Regulation of Stomatal Opening
The opening and closing of stomata are regulated by various factors, including light, humidity, and the plant's internal water status. Light triggers the uptake of potassium ions by the guard cells, leading to their swelling and the opening of the stomatal pore. Conversely, a decrease in light levels or high humidity causes the loss of potassium ions, leading to the shrinking of the guard cells and the closure of the stomatal pore.Study Guide
To understand stomata better, consider focusing on the following key points:- The structure and function of stomata
- The role of stomata in gas exchange and transpiration
- The regulation of stomatal opening and closing
- Comparing the behavior of stomata in different environmental conditions
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Worksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
Concepts of Physical Science (SB1, SB2, SB3, SB4)
The student demonstrates an understanding of the structure and properties of matter by identifying and comparing the characteristics of gases, liquids, and solids.
Concepts of Physical Science: A student should understand and be able to apply the concepts, models, theories, universal principles, and facts that explain the physical world. A student who meets the content standard should:
Develop an understanding of the interactions between matter and energy, including physical, chemical, and nuclear changes, and the effects of these interactions on physical systems.