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Transport in Plants

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
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 transmembrane pathway ?

The movement of water through cell membranes is called trans membrane pathway.
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Give the term for the ability to resist a pulling force.

Tensile strength
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Why the water is forced to move through cell membrane beyond endodermis ?

Water is forced to move through cell membranes beyond endodermis because of the suberin (waxy substance) present on radial walls of endodermal cells blocks water and solute movement through cell walls of endodermis. 
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Who introduced the apoplast—symplast concept ?

E. Munch (1930).
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Why the cortex produces no resistance to movement of water ?

The cortical cells are loosely packed and produce no resistance to movement of water via cell walls or apoplast.
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