Essays Tagged: "Xylem"

Discuss the xylem and phloem. (Structure, Changes in the Xylem of Woody Plants, Transport)

XylemStructureXylem's structure serves a duel purpose; support and transport. Cells that will become ... lignin. Lignin is a tough organic compound that makes wood strong and dense. When the cell walls of xylem conducting cells are complete they die. The contents within the cell disintegrate and leave a ... s to the living tissues in the vascular cambium and phloem. Flowering plants have a quite efficient xylem. The last act in life of some conducting cells is to digest parts of their end walls, forming ...

(4 pages) 152 4 4.5 Jan/2003

Subjects: Science Essays > Biology > Plant Biology

AP Biology Essay #7 concerning Evolution, created using the grading rubric, so will be an A+

vascular plants are much further evolved than the Algae. A few of these likely acquired traits are Xylem, and Phloem, which transport both water and food throughout the plant much like the veins in o ... ghout the plant much like the veins in our body transport oxygen through veins and arteries, though Xylem unlike Phloem use passive transport to accomplish this. The cuticle, or waxy covering of the v ...

(2 pages) 49 0 3.0 Feb/2004

Subjects: Science Essays > Biology

Biology Coursework Analysis and Evaluation (transpiration)

he stomata into the air. The process of transpiration takes place to continuously draw water up the xylem from the roots. This water is then drawn into the spongy cells to replace the lost water.My re ...

(2 pages) 43 0 3.6 Feb/2004

Subjects: Science Essays > Biology


olecules in that area; the plant would have to 'pull' up more water from the water tube through the xylem tissue causing an area of high concentration in the leaves. Which would of then caused rapid l ... ould be an increase in the transpiration rate. As the plants would 'pull' up more water through the xylem tissue, to cope with the increase pressure of osmosis and transpiration rates. While if the en ...

(3 pages) 57 2 5.0 Mar/2004

Subjects: Science Essays > Biology

Explain how translocation of sucrose occurs in the phloem as proposed by the mass flow hypothesis.

potential at the source end of the sieve tube. Water moves into the sieve tube through osmosis from xylem causing an increase in hydrostatic pressure at the source end of the sieve tube.At the Sink en ...

(1 pages) 34 0 3.0 Apr/2004

Subjects: Science Essays > Biology

Transpiration AP Lab

tes of transpiration using a controlled experiment, and make thin sections of stem, identify xylem and phloem cells, and relate the function of these vascular tissues to the structures of their ... t stem under water. This step is very important, because no air bubbles must be introduced into the xylem.4. While your plant and tubing are submerged, insert the freshly cut stem into the ope ...

(8 pages) 36 0 1.0 May/2005

Subjects: Science Essays > Biology


er moves into the plant roots by osmosis and continues to move across the cells of the roots to the xylem in the centre. There is a continuous gradient of water potential from water in the soil to the ... so water is continuously moving into the cells. This is because water is continuously moving up the xylem. The body of water moving across the cells exerts a pressure on the water in front of it (root ...

(1 pages) 760 0 0.0 Dec/2005

Subjects: Science Essays > Biology

Compare the structure and function of the xylem and phloem

Plants have two separate transport systems. A network of xylem vessels transports water and mineral ions from the roots to all other parts of the plant. Phlo ... s is because they are not as active as animals and do not need such rapid supplies of food. Neither xylem nor phloem transports oxygen as oxygen gets to a plants cell by diffusion. Both stems and root ... phloem transports oxygen as oxygen gets to a plants cell by diffusion. Both stems and roots contain xylem vessels and phloem tubes. In a stem these are grouped into vascular bundles arranged in a ring ...

(6 pages) 38 1 5.0 Apr/2006

Subjects: Science Essays > Biology > Plant Biology

The three theories of transport in the Xylem

Xylem is composed of a number of different types of cell, and may include long, thin, usually dead c ... nown as tracheids; fibres (schlerenchyma); thin-walled parenchyma cells; and conducting vessels.The xylem vessel has two main functions:* Xylem transports water and dissolved ions from the root system ... m transports water and dissolved ions from the root system to the stem.* The lignified thick-walled xylem cells strengthen the stem.There are three theories in which the xylem vessel transports water ...

(2 pages) 22 0 3.0 Jun/2006

Subjects: Science Essays > Biology

Transpiration in Plants

vels up from the roots, through the plants, and to the leaves. The water is carried by tubes called Xylem vessels, which have narrow diameters. They are microscopic capillary tubes, which allow capill ... stomata, which allow the plants to breathe. As more water escapes, more water is drawn up from the xylem by suction pressure.In order to defy such gravity pulling within the plant, there must be spec ...

(5 pages) 24 0 5.0 Sep/2007

Subjects: Science Essays > Biology > Plant Biology

"Transport systems play an essential role in the survival of flowering plants and mammals"Discuss.

nd mineral ions (macro and micronutrients) are absorbed by root hairs from the soil and passed into xylem tissue which passively transports the water and dissolved nutrients upwards throughout the pla ... he body via the aorta.Transport systems in flowering plants consist of two main conducting tissues; xylem and phloem which together make the vascular tissue of flowering plants. Xylem tissue is respon ...

(6 pages) 14 0 0.0 Nov/2008

Subjects: Science Essays > Biology