1(i)What is the main process which makes possible to reach water and dissolved mineral to reach at the top of a tree ?(ii) What causes creation of root pressure?(iii) At which time root pressure is important for a plant?

Open in App

Solution

(i). Transpiration pull is the main force responsible for the upward movement of water and minerals to the top of the tree. This pull is generated in xylem elements due to loss of water from the leaves by transpiration and this loss of water creates a negative hydrostatic pressure that exerts pulling force.
(ii). Root pressure is the positive pressure within the cells of the root system that causes sap to rise through a plant stem to the leaves. It is caused due to the active transport of various ions from the soil to the root xylem, followed by movement of water inside due to osmosis.
(ii). Root pressure is important, when soil moisture is high like at night or when transpiration is low during day.

Suggest Corrections

Similar questions

Q. Through which process is water and dissolved mineral salts transported from the root to other parts of the plant?

Absorption of minerals by the epidermal cells of root and root hair causes the water to enter from surrounding soil into roots. It further reaches the root xylem. Thus, due to a continuous uptake of water by root cells, a water pressure is created in the root xylem. This pressure is called as________

Q. Root pressure can transport water and dissolved mineral nutrients from roots through the xylem, to the tops of relatively short plants when transpiration is low or zero. The above statement was supported by:

Q. Water and dissolved minerals get into the root hair of a plant by a process called A and enter the conducting tissue B. The process C helps the water and dissolved minerals to move up through the tissue B in roots and stem, and reach the leaves of a plant. In the leaves food is made by a process D. This food is then transported to all the parts of a plant through tissue E. The process of distributing food made in the leaves to all the parts of the plants is called F.
(a) What are (i) A (ii) B (iii) C (iv) D (v) E, and (vi) F?
(b) Which tissue is made up of living cells : B or E?
(c) Which tissue, B or E, contains sieve tubes?
(d) Which tissue, B or E, contains tracheids?

Q. Consider the following statements
(i) In mycorrhizal association the fungus provides minerals and water to the roots
(ii) Root pressure accounts for the majority of water transport in tall trees
(iii) Less than one percent of water reaching the leaves is used in photosynthesis
(iv) The rate of movement of water through xylem is up to 15 metres per hour The number of correct statement is

Join BYJU'S Learning Program