51.
Asynchronous growth refers to the cultured plant cells vary greatly in _____.
A. size.
B. shape.
C. cell cycle.
D. all the above.
ANSWER: D
52. The auxins inhibit the production of certain secondary metabolites by the action of _____.
A. IAA.
B. 2,4-D.
C. NAA.
D. kinetin.
ANSWER: A
53. Plant growth regulators influence growth, metabolism and ________ of cultured cells.
A. differentiation.
B. elongation.
C. enlargement.
D. duplication.
ANSWER: A
54. The optimal pH for plant tissue cultures is in the range of _____.
A. 2-3.
B. 3-4.
C. 4-5.
D. 5-6.
ANSWER: D
55. The plant tissue culture medium can be sterilized in an autoclave at _____degree celcius.
A. 131.
B. 121.
C. 141.
D. 111.
ANSWER: B
56. The process for the fusion of a normal protoplast with an enucleated protoplast is _____.
A. hybridizaion.
B. cybridizaion.
C. rDNA technology.
D. transgenesis.
ANSWER: B
57. A cytoplasmic hybrid refers to _____.
A. cybrids.
B. chloroplast.
C. tonoplast.
D. protoplast.
ANSWER: A
58. FDA stands for _____.
A. Fluorescein diacetate.
B. Federal diacetate.
C. Fluorescein diacetate assay.
D. Federal Development Assay.
ANSWER: A
59. ___________ are the precursors for the synthesis of nopalines.
A. Pyruvate + amino acid
B. Alpha-Ketoglutarate + amino acid
C. Phosphoenolpyruvate + amino acid
D. Oxalate + amino acid
ANSWER: B
60. During the enzymatic degradation of cell walls, some of the adjoining protoplasts may fuse to form _____.
A. homokaryocytes.
B. heterkaryocytes.
C. eukaryocytes.
D. haploid.
ANSWER: A
