Question 10
Which advantage belongs to tissue culture in particular, rather than to cuttings, layering and grafting as well?
The right answer is the one marked above.
A large number of healthy plants can be raised within a small space. The starting piece is a few cells in a flask, so one parent yields far more plants, far faster, on a bench rather than in a field.
The other three are true of every vegetative method, artificial or natural, because they follow from the biology rather than the technique. A question asking what is special about one method is not answered by something all four share.