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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.
what is endosperm haustorium
Are the limbs modified into wings of bats and the wings of birds examples of evolutionary analogy or homology? What about whale fins compared to fish fins? Bat and bird wings h
The ultimate aim of somatic gene therapy is to alter the genetic material of living cells which involves transfer of DNA. Genetic material is transferred by various methods like us
Q. Destruction of microorganisms? Ans. Destruction or control of growth of microorganisms is the basis of food preservation. To 'preserve' actually means fro keep safe, r
R e striction enzyme analysis: The restriction endonuclease analysis of viral DNA fragments or DNA fingerprinting discovered in 1970s has revolutionized the study o
How does the addition of a watery secretion to the contents of the gut help in the process of digestion?
Asexual
the characteristics of flying fish belong to pisces
Q. What is the difference between sexual gametes and spores? Do humans present sexual gametes or spores? Sexual spores are structures generated from meiosis with ploidy number
Protozoans - Body Form The protozoan body is usually bound only by the cell membrane called plasmalemma. In some protozoans such as in ciliates the rigidity and the flexibili
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