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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.
Define drug effects on Carbohydrate metabolism? Carbohydrate metabolism: Hypoglycemic drugs such as insulin and sulphonylureas are prescribed because of their ability to increa
explain mode of nutrition
Monosaccharides :- Sugars consisting of a single polyhydroxy aldehyde or ketone unit.
Fatty acids have four main biological roles: 1. They are used to create sphingolipids and glycerophospholipids which are necessary elements of biological membranes; 2. Nume
Q. From which germ layer do the epidermis and the nervous system originate? What are other organs and tissues made from that germ layer? Epidermis and nervous system have the s
Cages for keeping animals in the science room It is frequently desirable in elementary and general science to stay animals caged in the science room for short periods of observ
Explain Thermal Decomposition Heating of food Thermal Decomposition Heating of food produces various chemical changes, some of which can be important to flavour, appearance, nu
VERTEBR A T A It is divided into two parts - 1. Agnetha 2. Gnetha S.No. C haracter A gnetha G
Define Criteria for Assessment of Vitamin K Status? The parameters of blood clotting time and prothrombin time are used as criteria to assess vitamin K status as this vitamin
mitosis define
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