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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.
How are the main classes of arthropods classified according to the presence of larval stage in their embryonic development? In crustaceans there are species with direct and oth
Explain the Formation of enzyme? Formation of enzyme: Vitamin D is essential for the formation of two enzymes - alkaline phosphtase in the intestinal lining (involved in cal
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List a few shortcomings of native starches which make it unacceptable in certain food applications. Lack of free-flowing properties of water repellence of the starch granules,
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Briefly describe about Caramelization? Caramelization results from the action of heat on sugars at about 175º C. At high temperatures, sugars dehydrate, break down and polymeri
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Define Hormonal Responses to Injury? A number of hormonal changes take place in patients following injury. There is a marked rise in the counter regulatory hormones, viz., glu
Define the effect of niacin deficiency on Nervous System? Delirium is the most common -mental disturbance in acute pellagra. Dementia is more frequently seen in the chronic cas
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