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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.
TYPE S OF NEURONS - The neurons are classified on the basis of their structure and function. (A) On the basis of the structure, the neurons are of four types.
What is an operon, and in what type of organism are operons found? An operon is a series of genes that code for exact products and the regulatory elements that control those ge
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Q Which are the organs and characteristics of the digestive system of earthworms related to the kind of diet of these animals? Small organisms ingested together with soil parti
Endocrine Interactions At the beginning of menstruation the inhibitory influence of the corpus luteum on the pituitary is removed and FSH is secreted in increasing amounts. Th
Define Observation for Benedict Test - Carbohydrates? An insoluble reddish brown precipitate of cuprous oxide will be obtained. This is similar to Fehling's test. The reddis
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Pericardial Valves: Carpentier Edwards (Perimount Valve) : Pericardium preserved in gluteraldehyde and mounted on flexible stent is available for mitral and aortic positions
Define Corneal Scar - Micronutrient Deficiencies? The corneal ulcer, on healing, leaves a white scar, which may vary in size depending upon the size of the ulcer. When the scar
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