Tag: water absorption and ascent of sap in plants
Questions Related to water absorption and ascent of sap in plants
Terms apoplast and symplast were first used by
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Clark
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Munch
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Dixon
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Lundegardh
Apoplast refers to the non living component of plant like intercellular spaces and cell wall. Transportation through apoplast is fast.
Choose the correct answers from the alternatives given.
If cell A with OP = 5 and TP = 4 is surrounded by cells with OP = 3 and TP = 1, what will be the direction of water movement?
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From other cells to cell A
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From cell A to other cells
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Water will not move
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None of these
DPD or diffusion pressure deficit determines the flow of water. Water moves from low DPD to high DPD.
The transportation of water and minerals from the root to the leaves is known as ________
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Capillary action
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Accent of sap
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Climbing
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Transportation
The transportation of water and dissolved minerals from the root to the leaves is known as ascent of sap. It is transported through xylem tissues. During transportation, there is large accumulation of mineral ions in the root hair cells by active transport. This results in the higher water concentration in the soil as compared to the cell sap of the root hair. Hence, water diffuses from the soil into the root hair. The root hair cells become turgid. From root hair cells, the water moves into the cortical cells. From the cortical cells, the water reaches the endodermis by osmosis. The endodermis then pushes water into the xylem tubes through passage cells.
Which is shown by the experiment Ascent of sap?
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The food materials are transmitted by phloem
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Water is transmitted by phloem
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Water is transmitted by xylem
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The food material is transmitted by xylem
The ascent of sap experiment demonstrates the absorption of water by root cells if plants and their upwards movement. The sap is the water and minerals absorbed by the roots and they are pushed upwards into the xylem and then it goes to other regions of the plant.
Ascent of sap will be maximum during
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Daytime
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Night time
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Early morning
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None of the above
Cohesion transpiration pull theory was put forward by Dixon and Jolly in 1894. It is also known as Dixon's theory of ascent of sap. During day time, there will be maximum water loss due to transpiration, hence, transpiration pull will also be maximum during day time. Consequently, maximum ascent of sap will occur during day time.
The rate of transpiration ........... the process of ascent of sap.
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Increases
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Decreases
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Do not affect
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Increases and then decreases
Transpiration causes the development of a pull or a negative pressure region which created a suction force to aid the ascent of sap. It increases the process of ascent of sap.
The root pressure theory considers ........... responsible for the ascent of sap.
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Gravitational pull
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Hydrostatic pressure
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Capillary force
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None of the above
The root pressure theory considers that hydrostatic pressure developed in the roots is responsible for pushing the water through the column. It depends on the active accumulation of minerals in the root cells which then causes passive absorption of water creating a high pressure.
Organic and mineral nutrients undergo______
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Unidirectional
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Bidirectional
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Multidirectianal
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Both A and B
Organic material in plants is transferred by phloem while water and mineral nutrients are transferred by xylem. It is a well-known fact that xylem only has unidirectional transport of water while phloem can exhibit bidirectional transport.
Movement of water and mineral salts in plant is __________.
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Osmosis
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Absorption
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Ascent of sap
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Active absorption
Ascent of Sap : Ascent of sap in the xylem tissue of plants is the upward movement of water from the root to the crown.
Pulsation theory was proposed by
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Godlewski
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Jagadish Chandra Bose
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Dixon and Joly
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Arthur