( grafting / tissue culture ) is method used for large scale multiplication to develop better variety of crops and to save endangered species of plants.

Grafting

Explanation:

Tissue culture is the growth of tissues or cells in an artificial medium separate from the parent organism, whereas grafting is a horticultural technique whereby tissues of plants are joined so as to continue their growth together.

This is why the correct answer is grafting :)

 Tissue Culture.

Explanation:

Plant tissue culture is the method used for large scale multiplication to develop better variety of crops and to save endangered species of plants.

That is the answer.

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i think that is new experiments yield untrustworthy data and should be carefully considered, because you don't know what will happen with the experiments.