Advertisements
Advertisements
Question
Will the ascent of sap be possible without the cohesion and adhesion of the water molecules? Explain.
Advertisements
Solution
In plants, the ascent of sap involves factors like root pressure, capillary action, adhesion-cohesion and transpiration. The movement of water up to the base of the stem is resulted only by root pressure. Water can raise only a few centimetres by capillary action so it is effective only in herbs. When there is a water column underneath which is to be pulled only then transpiration pull works. Hence, without adhesion-cohesion of water molecules ascent of sap is not possible.
APPEARS IN
RELATED QUESTIONS
What causes the opening and closing of guard cells of stomata during transpiration?
How does transpiration help the roots absorb water and minerals from the soil?
Define the termTranspiration
Define the term Transpiration stream
Name the process by which water loss takes place through the leaves.
Why is there a need for a transport system in plants and animals?
(a) State whether the following statement are True or False.
(b) Rewrite the false statement in the correct form by changing either the first or the last word only.
Most transpiration occurs at midnight.
Given below is a diagrammatic sketch (surface view) of a stomatal apparatus from a dicot leaf.
(a) Label the parts numbers 1-3
(b) Is this state, open or closed?
(c) Is this stoma, of a dicot leaf or a monocot leaf?
(d) Redraw a sketch of the stomatal apparatus in the state opposite to the one shown here.
Given alongside is the diagram of an experimental set-up to demonstrate a certain phenomenon in plants.
Name the phenomenon being demonstrated.
Give a reason.
What happens to the movement of the air-bubble if the apparatus shown above is kept in front of a fan?
Choose the correct answer:
The percentage of cuticular transpiration in plants is _____________
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.
Mention, if the following statement is True or False. If false rewrite the wrong statement in its correct form:
Calcium chloride paper is used to demonstrate transpiration
Name the cell that surrounds the stoma.
Plants lose water by the process of transpiration.
What causes the opening and closing of guard cells of stomata during transpiration?
Plants show temporary and permanent wilting. Differentiate between the two. Do any of them indicate the water status of the soil?
The radio labelled carbon in carbon dioxide supplied to potato plants in an experiment was seen in the tuber eventually. Trace the movement of the labelled carbon dioxide.
Name the structures through which Transpiration occur in a plant.
