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Loading and Unloading of Sieve Tubes
In order to understand the loading of food from manufacturing leaf cells to sieve tubes we must examine the anatomy of a minor vein shown in Figure. We can see
Figure: A cross-section of a minor leaf vein. (MC-Mesophyll Cell, XE -Xylem Elements, SE-Sieve Element, TC-Transfer Cells, PP-Phloem Parenchyma cell.
a xylem vessel (X), two sieve elements (SE) which are relatively smaller than other cells and without cytoplasm, the modified companion cells or transfer cells (TC) with dense cytoplasm and phloem parenchyma (PP) which is less dense and vacuolated.
Q. What are the pancreatic tissues involved respectively in the endocrine and exocrine secretions? What are their respective hormones and enzymes? The exocrine secretion of the
Why methyl alcohol is used in destarching?
Even though association between GAS pharyngitis and the ARF is fairly well established, the exact pathogenic mechanisms are not clearly understood. However, two mechanisms are post
Q. Indicating the name and respective ploidy of each involved cell how can the formation of sperm cells from germ cells be described? The formation of spermatogenesis or sperm
Acute Renal Failure You know that acute renal failure refers to the sudden deterioration in kidney function, characterised by reduced urine excretion to less than 10 ml/kg bo
What chemical is normally used to test for the presence of carbon dioxide? What is the result of the test if carbon dioxide is present? a) Lime water is used t
What is right patellar tendon Which of the following occur in response to an increase in the length of the right knee extensors in response to a quick tap applied to the right
Chemical Properties of Fatty Acids Esterification Like any other organic acid, fatty acids also form esters with various alcohols. An alcohol such as glycerol is reacted
Explain for Procedure Quantitative Determination of Viable Microbes? Now carry out the exercise following the steps included herewith: 1. Label the diluent tubes from 10 -1
Q. What is Gastritis? Gastritis is an inflammatory lesion of the gastric mucosa, (the inner lining of the stomach). The problem is seen in two forms: a) Acute gastritis
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