Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
sulphur s - macronutrientssulphur is present in the soil in inorganic and organic forms in most soils organically bounds is the major s reservoir the
potassium k - macronutrientsthe main source of k for plants comes from withering of k containing minerals potassium released by withering dissolves
phosphorus p - macronutrientsin soil phosphorus occurs almost exclusively in the form of orthophosphate substantial amount of p is associated with
long distance transportonce in the xylem vessels the transport of the mineral elements from the root to the shoot is driven by the gradient of
driving force - mineral nutritionlet us now find out what is the driving force involved in protein mediated transport many membrane transport
characteristics of nutrient uptakethese results show certain characteristics of nutrient uptake selectivity certain mineral elements are taken up
changes in the ions the concentration of potassium phosphate and nitrate declined significantly in the bathing medium within four days the
nutrient absorptionexcept for carbon oxygen and hydrogen which are provided by co2 and water all the other elements essential for plants are provided
biochemical function - essential elementselements mg mn k ca and fe are cofactors for many enzymatic reactions fe is carrier of electrons in electron
structural function - essential elementsthe elements nitrogen phosphorus and sulphur absorbed from the soil are essential components of amino acids
osmotic function - essential elementsplant cells generally contain mineral ions 10 to 1000 times higher in concentration than the surrounding soil
criteria of essentialityamon and stout as early as 1939 suggested certain criteria that an element must fulfil in order to be classified as essential
nutrient elements of plantslet us first find out the chemical composition of plants and see which element nature has selected to support their
normal 0 false false false en-in x-none x-none
distribution of stomatathere are two parameters normally used for expressing the distribution of stomata stomatal frequency the number of stomata per
alteration of turgor of guard cellsthere are two ways in which the relative turgor of guard cells may be altered a decrease in osmotic potential or
factors controlling stomatal aperturekhul ja sim sim the two rocks slide and the gates to a great treasure open with these magic words ali baba and
mechanism of stomatal openingit has been known for over a century that stomata open because of reversible turgor changes in the guard cells stomata
stomatal resistancestomatal resistance is most important because gas exchange between leaves and external atmosphere takes place entirely through
functions of stomatathe cuticle forms outermost surface of the leaf and offers resistance to the evaporation of water vapour and entry of carbon
water loss - plant water relationplants lose about 98 of water to the atmosphere by transpiration often water loss by transpiration exceeds gain by
water absorption and transpirationthe rate of water absorption is controlled by the rate of transpiration a high water potential in the atmosphere
root - plant water relationroot system is directly related to the absorption of water and its growth under field conditions is very much influenced
soil temperaturesoil temperature is known to influence water absorption and ultimately transpiration to a considerable extent in many plants water
permanent wilting percentage pwpit is the percentage of moisture in the soil at which a plant wilts and does not recover unless water is added to the