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Transport in Plants

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
Explain transpiration and photosynthesis are complementary to each other.

Transpiration : It is the evaporation of water from aerial parts of plant.

Photosynthesis : It is the process of manufacture of food from C02 and water by the green parts of plant.

It is the transpiration which creates a transpiration pull for absorption of water and minerals The water is raw material for photosynthesis. If water availability is limited then photosynthesis also becomes limited. Actively photosynthetic plant  needs proper supply of water. C4 plants were evolved only to use minimum amount of water and maximum use of C02 and they are double efficient to C3 plants.

C4 plant loses half the amount of water as compared to C3 plants for fraction of same amount of C02.

Thus it appears to be a compromise between transpiration and photosynthesis.


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. 

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.

Who introduced the apoplast—symplast concept ?

E. Munch (1930).

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

Tensile strength

What is transmembrane pathway ?

The movement of water through cell membranes is called trans membrane pathway.