Loading and unloading of sieve tubes, Biology

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

2234_Loading and Unloading of Sieve Tubes.png

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.

Posted Date: 1/17/2013 4:18:05 AM | Location : United States







Related Discussions:- Loading and unloading of sieve tubes, Assignment Help, Ask Question on Loading and unloading of sieve tubes, Get Answer, Expert's Help, Loading and unloading of sieve tubes Discussions

Write discussion on Loading and unloading of sieve tubes
Your posts are moderated
Related Questions
What is the significance of Axial skeleton? The bones which make up skeleton of the main body axis of vertebrates. It comprise the cranium, vertebral column, and rib cages, How

Define Reagents Required and Methodology for Mucic Acid Test? -   Sugar solution -   Conc. Nitric acid Methodology Take about 50 mg of sugar in a test tube. Add 1 ml

Tpes of Diarrhoea: Diarrhoea can be acute, chroniclpersistent diarrhoea and dysentery.  If an episode of diarrhoea lasts less than 14 days, it is acute diarrhoea. Acute wat

Define about the Photometry - colorimetry? Photometry is the measurement of the luminous intensity light or the amount of luminous light falling on a surface from such a source

Pathophysiology of Acute Renal Failure It is usually reversible but the deviation of physiologic function can be extreme and mortality in pediatric age group remains high. Th

Gastrointestinal Tract Function: As a result of burn  injury acute gastric dilation occurs, creating abdominal distention and  regurgitations. Malabsorption occurs secondary


Q What are the amphibian features that make them dependent on water to survive? Permeable skinexternal fecundation, body subject to dehydration, larval stage and eggs without s

Q. What are the dietary guidelines for gastritis? Energy: Give adequate calories through frequent feedings or else proteins would be utilized for energy of repair work. P

Q. What are the few examples of the energetic function of organic molecules? Since they are complex molecules, organic molecules store large amount of energy, presenting many c