(1) A ............. concentration of auxin promotes the growth of intact roots, whereas a ................ concentration inhibits root growth.
a. Higher, lower
b. Lower, higher
c. Both
d. None of
the above
(2) ................. inhibits flower formation in fruit crops.
a. PBZ
b. GA
c. Ethrel
d. KNO3
(3) ……………. sprays work to induce female and intersexual flowers in male plants of papaya.
a. Ethrel
b. CPPU
c. Both a and b
d. Gibberelline
(4) .................. is primary precursure of auxine biosynthesis pathway.
a. Tryptophan
b. Methionine
c. Mevalonic acid
d. diterpene acids
(5) Ethylene is biosynthesized from the amino acid ............... to S-adenosyl-L-methionine by the enzyme Met Adenosyl transferase.
a. Tryptophan
b. diterpene acids
c. Methionine
d. None of the above
(6) ...................... is constitute a large family of diterpene acids and are synthesized by a branch of the terpenoid pathway.
a. Auxin
b. Cytokinine
c. Gibberelline
d. Ethylene
(7) ABA biosynthesis takes place in ……………… and other plastids.
a. Mitochondria
b. Chloroplasts
c. None of the above
d. Nucleus
(8) ....................... is use for off season flower induction in mango.
a. Ethephone
b. Paclobutrazol
c. Ethereal
d. All of the above
(9) ................... inhibit seed germination
a. ABA
b. Gibberellins
c. Both a and b
d. None
(10) ................ stimulates the closure of stomata in the epidermis and increases the tolerance of plants to various kinds of stresses.
a. ABA
b. Gibberellins
c. Both a and b
d. None
