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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 Absorption and Transport of Vitamin E? Absorption of vitamin E from the intestine depends on adequate pancreatic function, biliary secretion and micelle form
Define the Post-Herbal Period? It is difficult to draw a sharp line of demarcation between the transition period, marked by various attempts of classification, all of which we
How do sponges try to protect themselves against harm from the environment? Is that method efficient or rudimentary? Sponges can close their pores to avoid the entrance of wate
Activated carbon has a much higher adsorption capacity than other materials. Carbon adsorbs objectionable odours, flavours, organic compounds and many hazardous chemicals. There
Explain An important strategy of group meetings An important strategy could be to conduct small group meetings for behavioural change encouraging full participation. The group
Explain the Components of heart sounds? The first major component is associated with mitral valve closure (M 1) and is due to abrupt arrest of the leaflet motion when the cusps
Describe the Frequency of low-risk coronary patients? For many low-risk coronary patients, particularly those following myocardial revascularization procedures, rehabilitation
Vasa efferentia are the ductules leading from: 1. Testicular lobules to rete testis 2. Rete testis to vas deferens 3. Vas deferens to epididymis 4. Epididymis to urethra
What is a distilling flask and how is it used? A distilling flask is a round bottom flask that often has two openings, and some of them have a long neck.
In the preceding block you learnt the Darwinian premise of natural selection based on certain facts and deductions thereof. You would have noticed that one of the foundations for t
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