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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 the basic Concept of Energy? Energy in simple terms may be defined as the ability, or power, to do work. As a student of dietetics and nutrition, you already know that
A) General: umbilical cord Placenta Bone marrow Ophthalmic cornea { conjectiva of the eye } Kidney Spleen (B) Dental: Dental pulp
If a person is heterozygous for the 32 allele of the CCR5 gene, how many of the four daughter cells produced by meiosis will have the 32 allele?
What is the relationship among environmental resistance and the population growth according to the biotic potential curve and the real population growth curve? The difference
What is tetrapoda
Explain the Gomez classification? It will be of interest to you to learn that in Mexico, a child specialist named Gomez and his co-workers proposed a classification expressing
How does the study of fossils strengthen the theory of evolution? The study of fossils reveals ancient and extinct species having many same structures to others of the present
What was the Oral Status of the Patient It is imperative that the patient carry out a strict oral hygiene regimen as dental plaque is one of the main factors that leads to impl
State the term Cercaria? A stage in the life cycle of trematode flukes. Cercaria develops from redia found in intermediate host. This tadpolelike organism is released from inte
Explain Atrial Switch Operation ? The hospital mortality reported varies between 0 and 15 per cent. Late survival is worse for TGA with VSD compared to simple TGA. 15 year surv
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