Loading and unloading of sieve tubes, Biology

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

2234_Loading and Unloading of Sieve Tubes.png

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.

Posted Date: 1/17/2013 4:18:05 AM | Location : United States

Related Discussions:- Loading and unloading of sieve tubes, Assignment Help, Ask Question on Loading and unloading of sieve tubes, Get Answer, Expert's Help, Loading and unloading of sieve tubes Discussions

Write discussion on Loading and unloading of sieve tubes
Your posts are moderated
Related Questions
Explain exotic species? Describe with the help of two examples how the exotic species disturb the native species of an ecosystem ?

What is Diagnosis of Heart Disease in the Newborn ? Clinical diagnosis of heart disease in the newborn can be quite challenging. Manifestations of potentially life threatening

Q. How do antibodies work to neutralize antigens? The immunoglobulins or antibodies act to facilitate the destruction of antigens: they attract phagocytic leukocytes, they dire

Define Reagents Required for Osazone Test? - Solutions of glucose, galactose,fructose, lactose, maltose, sucrose. - Phenyl hydrazine mixture (2 parts of Phenylhydrazine hydr

When resheathing needles, simple precautions to prevent injuries are to: 1. use only one hand to scoop the cap 2. hold the sheath with a hemostat (suggested but will require

You have 30 mL of a 1M sodium monophosphate buffer and you dilute dilute it to a volume of 10L. What is the concentration of your new solution? I came up with 0.003M, does that see

Closed Mitral Valvotomy :  This has been 1-eplaced by balloon mitral valvotomy (BMV) in most centres. It is done in cases of either pure mitral stenosis or with .triv

What best describes the amoebas division?  (1) It is a Mode of asexual account in which a one parent is involved. The amoeba cell, which is unicellular, separates into two daug

Explain Aspergillus - Fungi? Classification Kingdom - Mycetae Division - Amastigomycota Class - Ascomycetes Subclass - Plectomycetidae Order - Eurotiales Fami

Functions of Gluconeogenesis The significance of gluconeogenesis include: 1)  During starvation or during periods of  limited  carbohydrate intake, when  the levels of liv