7th Class Science Movement of Substance Transport System in Plant

Transport System in Plant

Category : 7th Class

*       Transport System in Plant

 

Inside the plant body, mainly three types of materials are transported. These are water containing minerals, digested food, and hormones. In plants two systems are involved in transportation, namely:

Xylem

Phloem  

 

*            Transportation of Water and Minerals

The system, which is responsible for transportation of water and minerals is called xylem. Let us know about the xylem..  

 

*           Xylem

Xylem is responsible for transportation of water and minerals. Water and mineral absorbed by the roots of a plant is transferred to the leaves by xylem. The transport system, xylem, is made up of two kinds of elements:

Xylem vessels

Tracheids

 

*             Xylem Vessels

Xylem vessels are made up of long dead cells. In the xylem vessels, dead cellsare joined with each other. And at the joint, cell wall is broken down. Thus atube like structure is formed and water and minerals absorbed by the root hairget a way to reach to the leaves.

   

 

*         Tracheids

Tracheids are also dead cells but they have the tapering ends rather than open. Therefore they do no form the vessels. The transportation of water from one dead cell to another occurs through pits present in their cell walls. Tracheids are water conducting tissues in only non-flowering plant.

 

 

*         Work of Root Hair

The job of root hair is to absorb the water and to take it to xylem tube. Xylem tubes reach to every leaves of the plant. So when water enters into xylem, it is transported to the required parts.

     

 

 

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         Which one of the following statements is not true?

(a) Water enters into xylem vessels through root hairs

(b) Root hairs lie in between soil particles

(c) The cells of xylem vessels have tapering end

(d) Cells of xylem vessels are joined with open ends

(e) None of these

 

Answer: (C)

 

 

      Transportation of water from one tracheid to another takes place through their tapering ends".

Read the above statement and select by which one of the following options, "tapering end 'given in the statement should be replaced?

(a) Vessels formed by the dead cells

(b) Flat ends of the tracheid cells joined together

(c) Pits present on the cell

(d) Selectively permeable cell wall

(e) None of these

 

Answer: (c)


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