Distinguish between stomata and hydathodes.

Stomata

Hydathodes

1. Stomata are A tiny pore in a plant leaf surrounded by a pair of guard cells that regulate its opening and closure, and serves as the site for gas exchange.

1. A pore that exudes water on the surface or margin of a leaf of higher plants

2. Water is lost in the form of water vapour

2. Water is lost in its liquid form. 

3. Carry out the process of transpiration. 

3. Carry out the process of guttation. 

4. Usually open during the day and closed during the night.

4. Open all time. 

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What is the mode of absorption by epiphytic roots ?


Epiphytic  roots absorb water by the process of imbition because of the presence of Velamen tissue in them.
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Why is imbibition considered to be diffusion?

Imbibition involve the movement of water along the concentration gradient. thus it is considered to be diffusion. 
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Difference between semipermeable and selectively permeable membrane

Semi-permeable membrane permit the movement of solvent molecules only through them, but prevent 
the movement of salute particles. e.g egg membrane, animal bladder, parchment paper.

Selectively or Differentially permeable membranes allow selective passage of solutes along 
with solvent, through them. Example Plasma membrane of the cell. 
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Difference between active and passive water absorption 

Active absorption takes place against the concentration gradient and requires energy. Whereas the passive absorption takes place along the concentration gradient and does not require energy.
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