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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.
Explain about the Musculoskeletal System? Osteopenia (decrease in bone mineral content) is observed with aging. There is an average of 30% decline in the bone mineral density f
Q. What is Sick Sinus Syndrome? Ans. When a slow resting pulse fails to accelerate normally with exercise, it has been labeled chronotropic incompetence, however, there i
Q What is metabolism? Metabolism is the set of chemical and physical processes upon which the life of the cells of a living being depends.
Prophylaxis Many experts recommend that sexually assaulted adults and adolescents be given treatment to prevent sexually transmitted infections, including therapy for gonorrhea
The role of ATP hydrolysis in actin polymerization is similar to the role of GTP hydrolysis in tubulin polymerization: both serve to weaken the bounds in the polymer and thereby pr
DE A T H - It is terminal end of the degeneration changes of old age. Death occurs when vescular system & respiratory system stop working. Failure of nervous system ma
What is the significance of lignin for the xylem formation? Lignin is vital because it is deposited on the cell wall of the xylem cells providing impermeability and rigidity to
Calculate the pH - microbial survival and growth? Presence of microorganisms also depends on the pH of the medium. Most bacteria grow optimally near neutral pH (optimum 6.5 - 7
Embryonic Induction and Cell Determination The cell determination or fate of embryonic cells is regulated through factors which may reside within the embryonic cells or by the
Cobalt (Co) - Micronutrients The Co concentration in the dry matter of plants grown in soil normally lies around 0.02 to 0.5 ppm. In soils the content varies from 1 to 40 ppm.
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