Q.(6) Give role of the following in plants and animals :
a. Guard cells
b. Tracheids and vessels
c. Phloem d. Bio-catalyst
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(a) Regulate the rate of transportation bu opening and closing of stomach.
(b)- Transport water and provide most of structural support in softwoods.
- Efficient system for transporting water from root to leaves and other parts.
(c) Transport of sugars from source tissue to sink tissue.
(d) Initiates or modifies the rate of chemical reaction in living body.
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