Exchange of germplasm is carried preferably through shoot tip culture because they are

Genetically stable

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Small and handy

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Virus free

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Solution

The correct option is B Virus free
Shoot tip is a virus free part in plant and it is because of the presence of meristematic cells in the shoot tip. These cells are actively dividing ones and helps in the apical dominance of the plant as well as increase of height of the plant as a combined effect of auxin. Meristematic cells are able to multiply at a very rapid rate compared to the multiplication of virus. This enables the shoot tips as virus free regions.
Thus, the correct answer is option C.

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