Answer:
(a) A phase of
growth which is maximum and fastest is exponential phase.
(b) Apical dominance
as expressed in dicotyledonous plants is due to the presence of more auxins in
the apical bud than in the lateral ones.
(c) In
addition to auxin, a cytokinin must be supplied to culture -medium to obtain a
good callus in plant tissue culture.
(d) Leaves
of vegetative plants are the sites of photoperiodic perception.
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