Plant Growth Regulators-1
(1) Which group of phytohormone produced in the shoot and root apices and migrates from the apex to the zone of elongation?
a. Auxins
b. Cytokinins
c. Ethylene
d. Abscisic acid (ABA)
(2) Plant hormones which are especially concerned with cell enlargement or the growth of the shoots.............
a. Auxins
b. Cytokinins
c. Ethylene
d. Abscisic acid (ABA)
(3) .................. is the only naturally occurring auxin in plants.
a. Indole Acetic Acid
(IAA)
b. Naphthalene acetic
acid (NAA)
c. Both of the above
d. None of the above
(4) The first naturally occurring cytokinin is named as ...............
a. Benzyladenine
b. Zeatin
c. Kinetin
d. All of the above
(5) The first naturally occurring cytokinin was found in ...............
a. Rice plants
b. Corn
c. Sugar cane
d. Beet root
(6) ................. regulate the transportation of metabolites in the phloem.
a. Abscisic acid (ABA)
b. Gibberelline
c. Auxins
d. Cytokinins
(7) .................... PGR could reduce pre-harvest fruit drop.
a. Naphthalene acetic acid (NAA)
b. Naphthalene acetamide (NAAm)
c. 1-methylcyclopropene (1-MCP)
d. All of the above
(8) .................... PGR is used as a chemical thinner in fruit crops.
a. NAA
b. BA
c. NAAm
d. All of the above
(9) .................proved to be the most effective promoter of flower bud formation.
a. Ethylene
b. Gibberelline
c. Both
d. None of the above
(10) Seed germination may require................... for the activation of vegetative growth of the embryo.
a. ABA
b. Gibberelline
c. Ethylene
d. Cytokinins
Answer: c. Gibberelline