Loading and unloading of sieve tubes, Biology

Assignment Help:

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.


Related Discussions:- Loading and unloading of sieve tubes

Gas transportation systems in animals, Q. Oxygen comes from the environment...

Q. Oxygen comes from the environment and carbon dioxide in the end returns to the environment. How do small animals solve the problem of taking away and bringing these molecules fr

What are the common exercises which diabetics patient can do, Common Exerci...

Common Exercises You should know some of the common exercises which patient can do without help of a professional or going to a fitness club. Advise the patient to go for regul

For non-insulin users consumption of alcohol, Q. For non-insulin users cons...

Q. For non-insulin users consumption of Alcohol? 1. Substitute for fat calories. A drink providing 100 calories should be substituted by 2 fat exchanges. . 2. Avoid if your

Substances that facilitate to compose the plasma membrane, Q. What are the ...

Q. What are the chemical substances that facilitate to compose the plasma membrane? The major constituents of the plasma membrane are phospholipids, proteins and carbohydrates.

Nutrition, You will be learning about vitamins and minerals (micronutrients...

You will be learning about vitamins and minerals (micronutrients) over a 2 week span. Remember phytochemicals from the Controversy section of chapter 2? They are not vitamins, b

What are the blood types of the abo blood system, What are the blood types ...

What are the blood types of the ABO blood system? The type A, the type B, the type AB and the type O are the blood types of the ABO blood system..

Blood sugar assessment, The measurement of blood sugar is of prime importan...

The measurement of blood sugar is of prime importance in the diagnosis and monitoring of patients with diabetes. You can refer sub-section 1.5.2 of Unit 1 to review about Glucose T

How do taenias obtain food and make gas exchange, How do taenias obtain foo...

How do taenias obtain food and make gas exchange? Tapeworms have hooks and sucking structures on their heads (scolex) that fixate the parasite in the gut wall; these structures

Define filming projection and technique, Q. Filming Projection and Techniqu...

Q. Filming Projection and Technique? Biplane ventriculography is preferred over single plane ventriculography because it gives more information without additional risk to the p

Dna, What is a helix?

What is a helix?

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd