Cohesion
Trending Questions
Q.
Molecules of water are held together by hydrogen bonds.This mutual intermolecular attractive force is called _______.
cohesive force
capillarity
imbibition
adhesive force
Q. The mutual attraction between water molecules is called while is the attraction of water molecules to the surface.
- osmosis
- cohesion
- capillarity
- adhesion
- transpiration
Q.
Molecules of water are held together by hydrogen bonds.This mutual intermolecular attractive force is called _______.
adhesive force
cohesive force
capillarity
imbibition
Q.
Which of the following contributes most to transport of water from the ground to the leaves of a tall tree?
Cohesion of water
Transpiration pull
Root pressure
Capillary rise of water in xylem
Q. Osmotic theory of active water absorption was given by
- Keller
- Bennet-Clark et al
- Atkins
- Kramer
Q. Prolonged water-logging kills plants due to
- Leaching of nutrients
- Dilution of soil nutrients
- Dilution of plant cell sap
- Stoppage of root respiration
Q. The phenomenon which forces water upwards into tracheary elements of xylem in the root region is
- Root pressure
- Turgor pressure
- Imbibition pressure
- Transpiration
Q. Active absorption of water by roots from the soil is mainly affected by
- Tension in cell sap due to transpiration.
- Hydrophobic nature of root hair.
- Osmotic concentration of xylem sap.
- Typical tissue organisation.
Q. Rate of water absorption is slow near freezing point because
- Water absorption is a metabolic process
- Cell growth stops
- Transpiration is reduced
- Cell membrane become more viscous
Q. Choose the correct answers from the alternatives given :
In which of the following plants metabolism would be hindered if leaves are coated with vaseline on their upper surface ?
In which of the following plants metabolism would be hindered if leaves are coated with vaseline on their upper surface ?
- Pistia
- VaIlisneria
- Lotus
- Mango