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Long Distance Transport
Once in the xylem vessels, the transport of the mineral elements from the root to the shoot is driven by the gradient of hydrostatic pressure (root pressure) and by the gradient of water potential. The gradient of water potential between roots and shoots is usually quite steep during the day when the stomata are open. It follows the pattern: atmosphere << leaf cells << xylem sap < root cells < external solution (soil). Transport in xylem vessels is mainly unidirectional. An increase in the transpiration rate enhances both the uptake and the translocation of mineral elements in the xylem.
Most of the water taken up by a plant passes through it and is evaporated to the atmosphere. What use is made of the tiny fraction of this water which is retained by the plant?
Describe tranposition of great arteries with intact ventricular septum? Transposition of great arteries with intact ventricular septum (or small VSD): There is usually inadequa
What is an example of a parasite relationship? An example would be a flea and a dog. The flea drinks the dog's blood, but does nothing helpful for the dog.
What are possible treatments available for a herniated disc injury?
What is Implant Failure Implant Failure : The total failure of implant to fulfil its purpose which are49 Surgical Complications, Long Term Implant Failures and Ma
Q. Of which cells is the nervous tissue constituted? How is the generic function of this tissue related to the characteristics of the main cell type that forms it? The nervous
Glycerol can act as a substrate for glucose synthesis by conversion to dihydroxyacetone phosphate and an intermediate in gluconeogenesis. In order for citric acid cycle pyruva
what is flora?
The left coronary artery arises from the left posterior aortic sinus. It runs to the left behind the pulmonary trunk and appears between left auricle and pulmonary trunk. In that p
A fifth member of the monoamine transmitter group is histamine. That release histamine as their neurotransmitter is located in the hypothalamus and project to cerebral cortex, lim
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