The following article highlights the two types of factors that affect the rate of transpiration. The factors affecting the rate of transpiration can be categorized into two groups: (A) External or Environmental Factors and (B) Internal or Structural or Plant Factors. Type # A. External or Environmental factors: 1. Atmospheric Humidity: The rate of transpiration is roughly inversely proportional to [...]
The following four points will highlight the four important theories of stomatal movement. The four important theories of stomatal movement are: (1) Theory of Photosynthesis in Guard Cells (2) Starch Sugar Inter-conversion Theory (3) Theory of Glycolate Metabolism and (4) Active K+ Transport or Potassium Pump Theory and Role of Abscisic Acid or Active Potassium Pump Theory. Many theories have [...]
Let us make in-depth study of the structure, number, distribution and types of stomata. Stomata was discovered by Pfeffer & name 'stomata' was given by Malphigii. Stomata cover 1-2% of leaf area. It is minute pore present in soft aerial parts of the plant. Algae, fungi and submerged plants do not possess stomata. (a) Stomata are minute pores of eliptical [...]