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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
Differentiate between the following
(b) Transpiration and Evaporation.

Transpiration

Evaporation

1. It is a physiological process and occurs in plants.

2. The water vapours diffuse through cucticle or through the stomata.

3. Living cells are involved.

4. Various forces such as vapour pressure, diffusion pressure, osmotic pressure, etc. are involved.

5. It is a slow process.

6. It is dependent upon anatomy of root, stem and leaves.

1. It is a physical process and occurs on any free surface.

2. Any liquid can evaporate. The living epidemis and stomata are not required.

3. It can occur from both living and non-living surfaces.

4. No such forces are involved.

5. It is a fast process.

6. It is independent of anatomy of leaf, stem and roots.

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What is transmembrane pathway ?

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

Tensile strength
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Who introduced the apoplast—symplast concept ?

E. Munch (1930).
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