Question:
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.
Answer:
(a)
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Diffusion |
Osmosis |
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It can occur in solids, liquids, and gases |
It occurs in the liquid medium. |
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It does not require a semi-permeable membrane. |
It requires a semi-permeable membrane. |
(b)
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Transpiration |
Evaporation |
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It is a physiological process. |
It is a physical process. |
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It is controlled by environmental factors as well as physiological factors of plants such as root-shoot ratio and number of stomata. |
It is entirely driven by environmental factors. |
(c)
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Osmotic Pressure |
Osmotic Potential |
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It is expressed in bars with a positive sign. |
It is expressed in bars with a negative sign |
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Its value increases with an increase in the concentration of solute particles. |
Its value decreases with an increase in the concentration of solute particles. |
(d)
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Imbibition |
Diffusion |
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in this process, water is absorbed by solids and colloids, causing an enormous increase in volume. |
Diffusion is the passive movement of particles, ions, and molecules along the concentration gradient. |
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It usually involves water. |
It involves solids, liquids, and gases. |
(e)
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Apoplast pathway |
Symplast pathway |
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It 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. |
It involves the movement of water through the interconnected protoplasts of the epidermis, cortex, endodermis, and root pericycle. |
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It is a faster process of water movement and water moves through mass flow. |
It is a slower process of water movement. |
(f)
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Guttation |
Transpiration |
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Water is lost from the leaves in the form of liquid droplets. |
Water is lost from the leaves in the form of water vapour. |
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It occurs through the vein endings of leaves. |
It occurs through the stomata. |
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