Age of Plants Germinating seeds generally show a slow rate of transpiration. High humidity means the air around the leaves is already saturated and has a higher concentration of water molecules than inside the leaves. Temperature An increase in the air temperature warms the water inside the leaves more quickly causing it to evaporate quicker.
In the case of the plants such as Opuntia and Asparagus the leaf is modified into thorns and the stem becomes flattened and green to perform the function of the leaf. Humidity Humidity refers to the amount of water vapour present in the atmosphere.
Types of Transpiration Transpiration in plants is essentially of three types. If humidity is high, rate of evaporation is low and so the rate of transpiration is slow.
Wind increases the rate of transpiration. The external factors are humidity, wind, atmospheric pressure, temperature, light and water. Temperature Increase in temperature increases the rate of transpiration as high temperature causes the water in intercellular spaces to vaporize at a faster rate.
The rest of the water is lost through the aerial parts of the plant by a process called transpiration. Root - Shoot Ratio Transpiration shows a direct relation with the amount of water absorbed by the roots and the water lost through leaves.
It also cause the stomata to open, thus more transpiration occurs during the day and the rate is higher on a sunny day compared to a cold dull day.
Sunlight Direct sunlight has the same effect as temperature as it warms the leaves up quicker. Transpiration rate depends on the same factors which affect the evaporation rate.
If the rate of transpiration exceeds the rate of absorption, the stomata get closed the cells lose their turgidity and the plant wilts. Water vapour from transpiring surfaces rapidly moves into the atmosphere which is at low pressure.
Water Less amount of soil water decreases the rate of transpiration. Therefore the increase in the root-shoot ratio will also increase the rate of transpiration. But winds at high velocity bring about closure of stomata and thus reduce the transpiration rate. The loss of water in the form of vapour from the aerial parts of the plant is referred to as transpiration.
Humidity Humidity is the concentration if water vapour in the air. Internal Factors These are factors prevailing within the plant which are inherent properties of the plant itself and include leaf structure, root-shoot ratio and age of plants. Wind Transpiration relies on diffusion. If the wilting is irreversible it is called permanent wilting.
Atmospheric Pressure Low atmospheric pressure increases the rate of transpiration. Such a structure is called a Cladode. This concentration gradient helps the transport of water molecules from the leaves by diffusion. External Factors These include conditions of the environment which affect the rate of transpiration.How Light and Wind Affect the Rate of Plant Transpiration Essay - Introduction: The purpose of this experiment is to find out if the rate of transpiration in plants can be increased using light and wind.
# 63 Transpiration in plants and factors affecting tranpiration rate. In the leaves, water molecules leave the xylem vessels and move from cell to cell.
* Most of the factors that result in a change in transpiration rate are linked to diffusion.
When writing explanation. Home > GCSE Biology > Transport in Plants. Factors affecting the Transpiration Rate. The list below gives the factors which affect the transpiration rate.
Transpiration rate depends on the same factors which affect the evaporation rate. Temperature. The cellular factors that affect transpiration are the number and distribution of stomata, the number of open stomata, the water status of the plant, canopy structure, etc.
The environmental factors that affect transpiration are- temperature, light, humidity and wind speed. Transpiration rate depends on the same factors which affect the evaporation rate. Temperature. An increase in the air temperature warms the water inside the leaves more quickly causing it to evaporate quicker.
It also increases the capacity of the air to absorb more water. Factors Affecting Rate of Transpiration in Plant The process of transpiration is influenced by a number of factors which may be broadly classified as External factors and Internal factors.
Factors Affecting Rate of Transpiration.Download