In crop improvement programmes,virus-free clo | vedclass

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(B) The correct answer is $B$ (shoot apex culture).In plant tissue culture,the shoot apical meristem is generally free from viral infections even if t

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shoot apex culture

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(B) The correct answer is $B$ (shoot apex culture).In plant tissue culture,the shoot apical meristem is generally free from viral infections even if the rest of the plant is infected.This is because the virus multiplication rate is slower than the rate of cell division in the meristematic region.By excising and culturing the shoot apex,scientists can regenerate healthy,virus-free clones of the parent plant.This technique is widely used in agriculture to produce disease-free planting material for various crops.

Column $X$	Column $Y$
$(1)$ Callus culture	$(P)$ Hybrid embryo rescue
$(2)$ Suspension culture	$(Q)$ Differentiated mass
$(3)$ Embryo culture	$(R)$ Undifferentiated mass

In crop improvement programmes,virus-free clones can be obtained through

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Select the correct match for $X$ and $Y$:

Column $X$ Column $Y$

$(1)$ Callus culture $(P)$ Hybrid embryo rescue

$(2)$ Suspension culture $(Q)$ Differentiated mass

$(3)$ Embryo culture $(R)$ Undifferentiated mass

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