Which of the following chiefly control the lengthening of the shoot and the coleoptiles by promoting cell elongation?
a) auxin
b) gibberellins
c) cytokinin
d) abscisic acid
Which of the following hormone of
inhibits growth in lateral buds thus maintaining apical dominance?
a) gibberellins
b) auxin
c) cytokinin
d) abscisic acid
The gibberellins were fist isolated from
a) bacteria
b) parasitic fungus
c) algae
d) angiosperms
Explanation: this fungus causes abnormal growth in rice seedlings
Which of the following phyto hormone dramatically restores the normal growth in dwarf plants?
a) auxin
b) gibberellins
c) cytokinin
d) abscisic acid
Which of the following phyto hormones cause seed germination in grasses?
a) auxin
b) cytokinin
c) gibberellins
d) abscisic acid
Which of the following phyto hormones break the dormancy of the seed and cancels the effects of the inhibitory substances?
a) gibberellins
b) abscisic acid
c) cytokinin
d) auxin
