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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.
What is the meaning of Paraplegia Paraplegia (from the Greek para, "alongside of," and plegia, "stroke") is a condition in which both lower limbs are paralyzed (quadriplegia i
Explain acylglycerols The most abundant class of food lipids is the acylglycerols, also known as glycerol esters of fatty acids, which dominate the composition of depot fats in
Explain the Tissue Synthesis for Wound Healing in Nutritional Care? Tissue proteins are synthesized only by amino acids brought to the tissues by circulating blood. The necessa
Define Plasma or serum ascorbic acid levels? The serum or plasma ascorbic acid levels are used as an index of ascorbic acid nutrition of humans. The normal serum values vary ov
Erwin Chargaff conducted a series of experiments in which he was calculating the amounts of dissimilar nucleotides that were present in dissimilar tissues and organisms. These stud
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How are secondary cell walls different from primary cell walls? Primary cell walls are assembled on the surface of the plasma membrane whereas the cell is growing. They can gro
Phenoxyethanol is dangerous and can be absorbed through the skin - official sites for toxicity data, though, show little toxicity in man and some toxicity (irritation) with high do
As with food crops, the "discovery, domestication and cultivation" of ornamental plants have a long history. There is indication that lilies were cultivated in China for both medi
State three conditions in a society which could contribute to a reduction in the birth rate. Birth rate might be decreased by (i) later marriages (as smaller families), (
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