Please send me the solution of these questions
1)Give reasons of the following
a) Occurrence of transpiration is demonstrated in closed environment.
b) we use the colbalt paper in expriements on transpiration
Answers
Explanation:
Transpiration is the process of water movement through a plant and its evaporation from aerial parts, such as leaves, stems and flowers. Water is necessary for plants but only a small amount of water taken up by the roots is used for growth and metabolism. The remaining 97–99.5% is lost by transpiration and guttation.[1] Leaf surfaces are dotted with pores called stomata (singular "stoma"), and in most plants they are more numerous on the undersides of the foliage. The stomata are bordered by guard cells and their stomatal accessory cells (together known as stomatal complex) that open and close the pore.[2] Transpiration occurs through the stomatal apertures, and can be thought of as a necessary "cost" associated with the opening of the stomata to allow the diffusion of carbon dioxide gas from the air for photosynthesis. Transpiration also cools plants, changes osmotic pressure of cells, and enables mass flow of mineral nutrients and water from roots to shoots. Two major factors influence the rate of water flow from the soil to the roots: the hydraulic conductivity of the soil and the magnitude of the pressure gradient through the soil. Both of these factors influence the rate of bulk flow of water moving from the roots to the stomatal pores in the leaves via the xylem.[3]
Overview of transpiration:
Water is passively transported into the roots and then into the xylem.
The forces of cohesion and adhesion cause the water molecules to form a column in the xylem.
Water moves from the xylem into the mesophyll cells, evaporates from their surfaces and leaves the plant by diffusion through the stomata
Transpiration of Water in Xylem
Answer:
its eassy
Explanation:
Answer:
a) At night they are closed. Hence more transpiration occurs during the day. During cloudy days, the stomata are partially closed and the transpiration is reduced. (b) Humidity of the atmosphere - When the air is humid; it can receive very less water vapour.
b)Rate of transpiration can be easily demonstrated by cobalt chloride paper test. Dry cobalt chloride paper that is blue in colour turns pink when it comes in contact with water. ... We can measure the rate of transpiration by using the time taken for the paper to change its colour from blue to pink.