Plants with poor root system are propagated through

Layering

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Leaf cuttings

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Stem cuttings

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Grafting

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Solution

The correct option is C Grafting
Plants with poor root system are propagated through grafting. Grafting is a horticultural technique whereby tissues of the plant are joined so as to continue their growth together. The two plants are selected, one with good roots called rootstock and another with good flowers, fruits, leaves or stem called scion. The scion contains the desired genes to be duplicated. The plants with poor roots but with the desired quality of other products are used as scion and grafted on plants with good mature roots.
Thus, the correct answer is option D.

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