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प्रश्न
Describe briefly the three physical properties of water which helps in ascent of water in xylem.
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उत्तर
Following are the three physical properties of water that help in the ascent of water in the xylem.
- Cohesion: It is the ability of water molecules to stick to each other.
- Adhesion: It is the ability of water molecules to stick to a surface.
- Surface Tension: The property of any liquid that tends to occupy the smallest possible surface area is called surface tension. Water makes a continuous column of water in the xylem vessels by adhesion cohesion and surface tension. Transpiration pull pulls this water as a column.
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संबंधित प्रश्न
An apparatus, as shown below, was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
- Name the process being studied.
- Explain the process named above in Q.3(a)(i).
- Why was the pot covered with a plastic sheet?
- Suggest a suitable control for this experiment.
- Mention two ways in which this process is beneficial to plants.
- List three adaptations in plants to reduce the above mentioned process.
Briefly explain, how transpiration helps in upward conduction of water in plants?
How does transpiration help the roots absorb water and minerals from the soil?
Name the process by which water loss takes place through the leaves.
Differentiate between osmosis and transpiration.
How does transpiration help in the uptake of water from the soil?
Why is there a need for a transport system in plants and animals?
Give suitable explanation for the following:
Perspiration and transpiration help to cool the body temperature of the organism.
Choose the correct answer:
The percentage of cuticular transpiration in plants is _____________
The figure given below represents an experimental setup with a weighing machine to demonstrate a particular process in plants. The experimental setup was placed in bright sunlight. Study the diagram and answer the following questions.
Name the process intended for study.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Name the process being studied.
An apparatus as shown below was set up to investigate a physiological process in plants. The setup was kept in sunlight for two hours. Droplets of water were then seen inside the bell jar. Answer the questions that follow:
Explain the process named above in 7.1.
Design an experiment to demonstrate the transpiration process.
Stomata of a plant open due to ______.
What causes the opening and closing of guard cells of stomata during transpiration?
Boojho’s uncle was hospitalised and put on dialysis after a severe infection in both of his kidneys.
When does it become necessary to take such a treatment?
Keep some freshly cut flowers in a solution of food colour. Wait for sometime for the dye to rise in the flower, when the stem of the flower is held up in light, coloured strands can be seen inside. Can this experiment demonstrate which tissue is conducting water up the stem?
Water molecule is very polar. Polar end of molecule attracts opposite charges on another water molecule (acts like magnet). How will you explain this property of water with reference to upward movement of water? Comment on the upward movement of water given the intermolecular hydrogen bonding in water.
Transpiration occurs:
