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प्रश्न
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उत्तर
Root Pressure is the pressure exerted on the liquid contents of the cortical cells of the root, under fully turgid condition, forcing a quantity of water into the xylem vessels and through them upwards into the stem up to a certain height.
Demonstration of Root pressure:
(a) Take a well matured healthy herbaceous plant.
(b) The stem of the plant is cut a few centimeters above the base with a sharp knife and attached to a manometer through a rubber tube.
(c) After a few hours, the level of mercury rises in the manometer.
(d) This is due to the pressure created by water exuded from the cut end of the plant on account of root pressure generated due to entry of water in the root cells.
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संबंधित प्रश्न
The figure given below is a diagrammatic representation of a part of the cross section of the root in the root hair zone. Study the same and then answer the questions that follow
(i) Name the parts indicated by the guidelines 1 to 4.
(ii) Which is the process that enables the passage of water from the soil into the root hair?
(iii) Name the pressure that is responsible for the movement of water in the direction indicated by the arrows. Define it.
(iv) Due to an excess of this pressure sometimes drops of water are found along the leaf margins of some plants especially in the early mornings. What is the phenomenon called?
(v) Draw a well labelled diagram of the root hair cell as it would appear if an excess of fertiliser is added to the soil close to it.
What part is played by The cytoplasm in the uptake of water into the root hair?
Choose the correct answer:
Which one is semi-permeable?
What is toxicity ?
Draw a diagram of the root hair cell as it would appear when a concentrated solution of fertilizers is added near it.
Fill in the Blank
Leaves get wilted if _________ is removed from the plant.
Outer layer of root hair is made up of ________.
Identify the part of the plants which is responsible for maximum absorption of water.
Why and how does water enter continuously into the root xylem?
Water in the root enters due to ______.
