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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.
MODER N CELL THEORY Also known as cell doctrine or cell principle. [Cell theory + cell lineage theory = cell principle] Schleiden-Schwann's cell theory and cell lineage
What is Mendelian Genetics? Mendelian Genetics : In 1868, an Austrian monk, Gregor Mendel, first published the basics of a study we now call Mendelian genetics. Mendel obser
Determine the maximum crop yield In determining maximum crop yield it was thought that a given plant let us say corn, is only inherently capable of producing a given amount of
what is cockroach respiratory system?
Take the prepared slide of Euglena and focus it first under low power and next under the high power of tlie microscope. Observe tlie following characteristics: i) Euglena is an
Signify the term - opercular gill. The gill found in bony fish. Operculum is the outer covering of the gill. When it's drawn away from the body, it pulls water inside the bucca
type study of polystomella
DISORDER S OF THE GONADS Hypogonadism. Inadequate gonadal function is called hypogonadism. It is due to defects in, or injury to the hypothalamus, the pituitary gland, of th
DIFFERENCE S BETWEEN MYOSIN AND ACTIN FILAMENTS Myosin filaments (primary filaments) Actinfilament s (secondary filaments)
Describe Basic steps in genetic engineering
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