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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
field capacity fcit is the capacity of a field to hold the amount of water against gravitational forces it is expressed as the percentage of the dry
water absorptionwater status of a plant is determined by two major factors i water absorption and ii water loss we deal with water absorption in this
physical concepts of plant water relation - osmosisosmosis is a special case of diffusion here the movement of water solvent takes place from a
physical concepts of plant water relation - diffusiondiffusion is a spontaneous process that leads to net movement of a substance from a region of
basic physical concepts of plant water relationthe main idea of this section is to explain the concept of chemical potential of water or water
relation of water content to functionsif an aquatic plant appearing turgid is removed from water and left in the open it quickly wilts the water
plant waterrole of water in plants you know that water is the main constituent of plant cells it performs the following major functionswater as a
pheromones serving functions other than reproductionbesides sexual responses as described above pheromones mediate several other types of behaviour
neural basis of responses to sex pheromonesthe ability of insects to detect and discriminate between a variety of pheromones with great sensitivity
pituitarythe pituitary is also known as hypophysis it is composed of two embryologically distinct tissue the anterior pituitary or adenohypophysis is
action of hormoneswe said earlier that hormones are released into the blood stream or extracellular fluid and therefore reach most of the cells of
secretion of hormonesthe secretion of most hormones except steroid is by the process of exocytosis figure summarises the formation transport release
synthesis and storage of hormonethe synthesis and storage of hormone depends on the nature of the hormone steroid hormones are secreted in diffuse
types of neural networksneural networks can be grouped into sensory filter networks that are organised so as to pass on only certain features of a
properties and functions of synapsesthere is an interval between depolarisation of the presynaptic terminal and the earliest appearance of a