Which breaks bud dormancy of potato tuber?
Gibberellin
IAA
ABA
Zeatin
Abscisic acid controls
cell division
leaf fall dormancy
shoot elongation
cell elongation and wall formation
What reason will you assign for coconut milk used in tissue culture?
Gibberellins
Cytokinins
Auxins
Ehtylene
A plant hormone used for inducing morphogenesis in plant tissue culture is
gibberellins
cytokinins
ethylene
abscisic acid
Which of the following gas is a growth regulator?
acetylene
benzene
methane
Glycolate induces opening of stomato in
presence of oxygen
low CO2 conc.
high CO2 conc.
absence of CO2
Leaves of many grasses are capable of folding and unfolding because they
are very thin
are isobilateral
have specialized bulliform cells
have parellel vascular bundles
The growth of plant is
limited
unlimited
unlocalised
none of these
Which one increase in the absence of light?
Uptake of minerals
Uptake of water
Elongation of internodes
Ascent of sap
One set of a plant was grown at 12 hr day and 12 hr night period cycles and it flowered while in the other set night phase was interruped by flash of light and it did not produce flower. Under which one of the following categories will you place this plant?
Long-day
Darkness neutral
Day neutral
Short-day
