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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.
a) In what form do plants absorb calcium from the soil? b) List any two calcium deficiency symptoms in plants.
1. In the human, normal pigmentation ( A ) is dominant to albinism ( a ). What results would be expected from the following matings, both genotypically and phenotypically? AA x
Describe the factors that are involved in the regulation of respiration in a child who decides to hold his/her breath for as long as possible.
Properties of Amylopectin and Amylose In plants, starch is packaged in granules, which vary in their shape and size, when isolated from different sources. The size of these gr
what are the effects of mining and farming on the phosphorus cycle?
Population Dispersal Population dispersal is the movement of individuals into or out of the population or the population area. It occurs in three following ways in a popu
Examination of the Prosthesis It is important to examine the prosthesis thoroughly. This involves assessing mobility, checking screws, evaluating attachments and porcelain res
explain excretory system of prawn?
Proteolytic enzymes They catalyze the hydrolysis of peptide bonds in other proteins. In order to prevent them doing generalized damage to all cellular proteins, they are often
Define Vitamins and Minerals needs in Nutrient Requirement and Dietary Management Although the exact requirements are not known, it is generally recommended to give plenty of f
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