Differentiate
between the following:
(a)
Diffusion and Osmosis
(b)
Transpiration and Evaporation
(c)
Osmotic Pressure and Osmotic Potential
(d)
Imbibition and Diffusion
(e)
Apoplast and Symplast pathways of movement of water in plants.
(f) Guttation and Transpiration.
Differentiate between the following:
(a) Diffusion and Osmosis
(b) Transpiration and Evaporation
(c) Osmotic Pressure and Osmotic Potential
(d) Imbibition and Diffusion
(e) Apoplast and Symplast pathways of movement of water in plants.
(f) Guttation and Transpiration.
(a) Diffusion
and osmosis
-
Diffusion
Osmosis
1.
Diffusion is the passive movement
of particles, ions, and molecules along the concentration
gradient.
1.
Osmosis is the process in which
the diffusion of a solvent (water) occurs across a semi-permeable
membrane.
2.
It can occur in solids, liquids,
and gases.
2.
It occurs in the liquid medium.
3.
It does not require a
semi-permeable membrane.
3.
It requires a semi-permeable
membrane.
(b) Transpiration
and evaporation
-
Transpiration
Evaporation
1.
It occurs in plants.
1.
It occurs from any free surface
and involves living and non-living surfaces.
2.
It is a physiological process.
2.
It is a physical process.
3.
It occurs mainly through the
stomatal pores on plant leaves.
3.
It is occurs through any free
surface.
4.
It is controlled by environmental
factors as well as physiological factors of plants such as
root-shoot ratio and number of stomata.
4.
It is entirely driven by
environmental factors.
(c) Osmotic
pressure and osmotic potential
-
Osmotic pressure
Osmotic potential
1.
It is expressed in bars with a
positive sign.
1.
It is expressed in bars with a
negative sign.
2.
It is a positive pressure.
2.
It is a negative pressure.
3.
Its value increases with an
increase in the concentration of solute particles.
3.
Its value decreases with an
increase in the concentration of solute particles.
(d) Imbibition
and diffusion
-
Imbibition
Diffusion
1.
Imbibition is a special type of
diffusion. In this process, water is absorbed by solids and
colloids, causing an enormous increase in volume.
1.
Diffusion is the passive movement
of particles, ions, and molecules along the concentration
gradient.
2.
It usually involves water.
2.
It involves solids, liquids, and
gases.
(e) Apoplast
and symplast pathways of movement of water in plants
-
Apoplast pathway
Symplast pathway
1.
The apoplast pathway involves the
movement of water through the adjacent cell walls of the
epidermis and cortex. The movement of water is restricted at the
casparian strips of the root endodermis.
1.
The symplast pathway involves the
movement of water through the interconnected protoplasts of the
epidermis, cortex, endodermis, and root pericycle.
2.
It is a faster process of water
movement and water moves through mass flow.
2.
It is a slower process of water
movement.
(f) Guttation
and transpiration
-
Guttation
Transpiration
1.
It occurs usually at night.
1.
It occurs usually during the day.
2.
Water is lost from the leaves in
the form of liquid droplets.
2.
Water is lost from the leaves in
the form of water vapour.
3.
It occurs through the vein
endings of leaves.
3.
It occurs through the stomata.
4.
It is an uncontrolled process.
4.
It is a controlled process.
(a) Diffusion and osmosis
-
Diffusion
Osmosis
1.
Diffusion is the passive movement of particles, ions, and molecules along the concentration gradient.
1.
Osmosis is the process in which the diffusion of a solvent (water) occurs across a semi-permeable membrane.
2.
It can occur in solids, liquids, and gases.
2.
It occurs in the liquid medium.
3.
It does not require a semi-permeable membrane.
3.
It requires a semi-permeable membrane.
(b) Transpiration and evaporation
-
Transpiration
Evaporation
1.
It occurs in plants.
1.
It occurs from any free surface and involves living and non-living surfaces.
2.
It is a physiological process.
2.
It is a physical process.
3.
It occurs mainly through the stomatal pores on plant leaves.
3.
It is occurs through any free surface.
4.
It is controlled by environmental factors as well as physiological factors of plants such as root-shoot ratio and number of stomata.
4.
It is entirely driven by environmental factors.
(c) Osmotic pressure and osmotic potential
-
Osmotic pressure
Osmotic potential
1.
It is expressed in bars with a positive sign.
1.
It is expressed in bars with a negative sign.
2.
It is a positive pressure.
2.
It is a negative pressure.
3.
Its value increases with an increase in the concentration of solute particles.
3.
Its value decreases with an increase in the concentration of solute particles.
(d) Imbibition and diffusion
-
Imbibition
Diffusion
1.
Imbibition is a special type of diffusion. In this process, water is absorbed by solids and colloids, causing an enormous increase in volume.
1.
Diffusion is the passive movement of particles, ions, and molecules along the concentration gradient.
2.
It usually involves water.
2.
It involves solids, liquids, and gases.
(e) Apoplast and symplast pathways of movement of water in plants
-
Apoplast pathway
Symplast pathway
1.
The apoplast pathway involves the movement of water through the adjacent cell walls of the epidermis and cortex. The movement of water is restricted at the casparian strips of the root endodermis.
1.
The symplast pathway involves the movement of water through the interconnected protoplasts of the epidermis, cortex, endodermis, and root pericycle.
2.
It is a faster process of water movement and water moves through mass flow.
2.
It is a slower process of water movement.
(f) Guttation and transpiration
-
Guttation
Transpiration
1.
It occurs usually at night.
1.
It occurs usually during the day.
2.
Water is lost from the leaves in the form of liquid droplets.
2.
Water is lost from the leaves in the form of water vapour.
3.
It occurs through the vein endings of leaves.
3.
It occurs through the stomata.
4.
It is an uncontrolled process.
4.
It is a controlled process.
