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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
Describe the significance of diffusion.

Significance of diffusion :

1. The cell walls of plant cells remain moist due to diffusion of water molecules from one cell to the other.

2. The ions in the cells get uniformly distributed due to diffusion.

3. Transpiration is also due to diffusion of water vapour from intercellular space of spongy parenchyma into the atmosphere through stomata or cuticle.

4. The exchange of gases occurs through stomata due to diffusion.

5. The aroma or fragrance of flowers spreads due to the diffusion and insects are attracted for pollination.

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Give the term for the ability to resist a pulling force.

Tensile strength
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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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Who introduced the apoplast—symplast concept ?

E. Munch (1930).
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