1. Gibberellins was named after a fungus called
a) Gibberella fujikuroi
b) Gibberella gaditijirrii
c) Gibberella acuminata
d) Gibberella africana
2. Gibberellins are chemically
a) phenolic derivatives
b) terpenoid derivatives
c) adenine derivatives
d) alkaloid derivatives
3. Gibberella fujikuroi the fungus causes
a) foolish seedling disease of rice or bakanae disease
b) damping off seedling disease of rice or bakanae disease
c) fungal blight disease of rice or bakanae disease
d) rust disease of rice or bakanae disease
4. The most studied gibberellin is
a) GA1
b) GA9
c) GA3
d) GA4
5. All are anti giberrellins except
a) acetosyringone
b) Amo1618
c) maleic hydrazide
d) phosphon D
6. All are functions of gibberellins except
a) promote cell elongation
b) promote dormancy
c) promote elongation of internodes
d) promotes parthenocarpic fruit fromation
7. Which of the following bioassay is used to test the presence of giberrillins
a) chlorophyll preservation test
b) dwarf pea elongation technique
c) rice seedling growth inhibition test
d) excised radish cotyledon enlargement test
8. The gibberilins present in the aleurone layer of barley increase transcription of
a) lipase and protease
b) protease and cellulase
c) protease and amylase
d) lipase and cellulase
9. Elongation of rosette plants is achieved by treatment with
Elongation of rosette plants
a) auxin
b) zeatin
c) cytokinin
d) gibberrellin
10. Translocation of gibberrelins is non-polar and predominantly takes place through
a) xylem
b) phloem
c) both phloem and xylem
d) capillary rise
11. The hormone which is involved in regulation of florigen synthesis
a) ethylene
b) zeatin
c) cytokinin
d) gibberrellin
12. Which is the giberrellin involved in elongation responses
a) GA1
b) GA9
c) GA3
d) GA4
13. Which is the giberrellin involved in flowering
a) GA1
b) GA9
c) GA3
d) GA4
14. Early stages of gibberrellin synthesis take place in
a) mitochondria
b) peroxisome
c) plastids
d) cytoplasm
15. Genetic dwarfism can be nullified by spraying with
a) auxin
b) zeatin
c) cytokinin
d) gibberrellin
Answers | ||
1-a | 6-b | 11-d |
2-b | 7-b | 12-a |
3-a | 8-c | 13-b |
4-c | 9-d | 14-c |
5-a | 10-b | 15-d |