Why plant does not need a pump to transport material unlike animals which have heart to do the job?

Answer 1

Plants have extensive networks of tubes (xylem and phloem) which act in combination to assure the plant's nutrition. The xylem sap can rise to levels of 100 ft or more due to root pressure.

Answer 2

plants have a vascular system that that is similar to the blood vessels in animals. However rather then having a heart to move their fluids about other forces are utilised.

Current theory holds that in small plants, root pressure alone is enough to keep fluids moving to all the of the plants extremity's. In the case of larger plants and trees just root pressure would not be able to accomplish the job. the movement of liquids upward through the xylem tissues is done by what is referred to as cohesion-tension theory. Water molecules are strongly attracted to each other, i.e cohesion. at the same time they are strongly attracted to the rigid walls of the xylem vessels, i.e, adhesion.

When water evaporates through the leaves, the water column in the vessels is subjected to tension, ie the cohesion of the water molecules pull the molecules that are below them up into the leaves to replace the molecules that have evaporated. The molecules cant pull inwards away from the walls of the xylem vessel walls because of adhesion. The liquid can only be puled upwards, This is called transpirational pull. And the water constantly is pulled up the xylem as a result of the transpiration off the leaves. as this is happening water enters the roots from the soil to replace the water lost from the top of the column.

Downward flow of nutrient's, plant hormones, and other materials is covered by the by the pressure-flow hypothesis, proposing that nutrients (carbohydrates) move from where they are made and stored, (the source), to where they are used and stored, (the sink). The process begins when carbohydrates are transported into sieve tubes. As they enter the tube, water is also transported in by osmosis and a positive pressure builds up at the source end. This is the pressure part of the hypothesis. This process is reversed at the sink end of the sieve tube.

Answer 3

Since the conducting tissue in plants is different than animals hence plant do not have pumping organ.

Answer 4

Plants have a slower metabolic rate and can get by with capillary action.

Answer 5

I do not knw