31. _____ is the most effective cytokinin commonly used in shoot tip or meristem culture.
A. NAA.
B. 2, 4-D.
C. BAP.
D. Zeatin.
ANSWER: C
32. Coconut milk and ________ are also effective for the growth of shoot apices.
A. Gibberellic acid.
B. Auxin.
C. Cytokinin.
D. Ethylene.
ANSWER: A
33. Higher plant body is _________.
A. unicellular.
B. multicellular.
C. enucleated.
D. binucleated.
ANSWER: B
34. . Small excised portion of the _____ is used to produce mass of cells.
A. callus.
B. explant.
C. fragments.
D. totipotent.
ANSWER: B
35. The excised plant tissues loose its _______ integrity in culture.
A. chemical.
B. physical.
C. structural.
D. biological.
ANSWER: C
36. Who first succeeded in promoting the development of callus tissue?
A. Gautheret.
B. Nobecourt.
C. Can Overbeek.
D. Conklin.
ANSWER: A
37. The callus tissue formation is processed through _______ of the explant.
A. cell alteration.
B. cell lengthening.
C. cell expansion.
D. cell stringent.
ANSWER: C
38. 2, 4-D alone is sufficient for _______ culture.
A. callus.
B. organ.
C. anther.
D. pollen.
ANSWER: A
39. _______ is required for growth of cell.
A. Gibberrellin.
B. Auxin.
C. Cytokinin.
D. Ethylene.
ANSWER: B
40. _____ is required for cell division
A. Gibberrellin.
B. Auxin.
C. Cytokinin.
D. Ethylene
ANSWER: C
