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Q.

What changes would occur in a parenchyma cell to form a treachery element?
(i) Loss of protoplasm contents
(ii) Deposition of strong and rigid secondary cell wall
(iii) Lignocellulosic deposition in secondary cell wall
 

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a

 i and ii only

b

i, ii and iii

c

ii and iii only

d

i and iii only

answer is B.

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Detailed Solution

To form a tracheary element, the cells would lose their protoplasm. They also develop a very strong, elastic, lignocellulosic secondary cell walls, to carry water to long distances even under extreme tension.

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