Necessity of transport in phloem, Biology

Necessity of Transport in Phloem

Leaves produce photoassimilates and support various tissues including roots. The excess photoassimilates and metabolites stored in specialised tissues produce fruits and seeds which germinate and regenerate the plant in the appropriate season. The leaves at the canopy of a tree are at a distance from roots. This can vary from a few millimetres to more than 100 meters. All in all we need an extensive transport system to carry the products of photosynthesis and nitrogen metabolism over medium and long distances. Diffusion is too slow a process to achieve this task over such large distances; what is required is a convective flow in the specialised vascular system so that the photosynthates reach all the needy tissues. The transport system has to be as extensive and ramified as the arterial and venous network in an animal body.

However, plants are devoid of a specialised pump such as heart meant for blood circulation. Though we have not yet fully understood how plants achieve this goal, they do carry out this exceedingly difficult task without a heart. Leaves manage to feed the tissues over vast expanses of the plant body with photosynthates necessary to fulfil their requirement.

Posted Date: 1/17/2013 3:55:30 AM | Location : United States







Related Discussions:- Necessity of transport in phloem, Assignment Help, Ask Question on Necessity of transport in phloem, Get Answer, Expert's Help, Necessity of transport in phloem Discussions

Write discussion on Necessity of transport in phloem
Your posts are moderated
Related Questions
Food Spoilage Bacteria - Lactobacillus Different organisms of this group, also known as "lactic acid bacteria", have different properties but all of them produce lactic acid fro

Define Basal Metabolism and Energy Expenditure at High Altitude? The energy and nutrient requirements depend upon total energy expenditure and metabolic rate of the individual.

What are the dietitians services Dietitians are engaged in a variety  of  positions and  in a number of  work settings. Of course the largest proportion is  involved engaged in

Explain the Composition of Sabouraud Agar? Sabouraud agar is used for cultivation of yeasts and moulds. Peptone - 10.0 gm Dextrose - 40.0 gm Agar - 15.0 gm Distille

Define Structural Elements - Biological Functions of Proteins? Structural proteins are fibrous proteins. The well known of the fibrous proteins are possibly the keratins, which

Q. PH of food in pectic ulcer? PH of food: It has. a little therapeutic importance except for patients with lesions in the mouth or oesophagus. Most foods are considerably les

The Biological Catalysis Enzyme: Biological catalysis  are called enzyme. An enzyme can be defined as an organic  substance that tremendously accelerates a chemical  reaction w

Syngamy - Protozoan The two gametes may be morphologically similar (isogametes) or dissimilar (anisogametes). The gametes also vary in form, they may be flagellated or amoeboi

Autumn (fall) overturn In autumn or early winter the air temperature falls, resulting in the cooling of the surface waters. When the surface water cools to 4°C it becomes dens

Results: Early mortality for tricuspid valve replacement is around six per cent. But depending on the patient's class of symptoms and the number of concomitant procedures, this c