E-PolyLearning

51. When plated only in nutrient medium, how much time is required for the protoplast to synthesize new cell wall?
a. 2-5 days
b. 5-10 days
c. 10-15 days
d. 15-17 days
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Answer: (b).5-10 days

52. Cellular totipotency is the property of
a. plants
b. animals
c. bacteria
d. all of these
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Answer: (a).plants

53. Agrobacterium based gene transfer is efficient
a. only with dicots
b. only with monocots
c. with both monocots and dicots
d. with majority monocots and few dicots
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Answer: (a).only with dicots

54. The phenomenon of the reversion of mature cells to the meristematic state leading to the formation of callus is known as
a. redifferentiation
b. dedifferentiation
c. either (a) or (b)
d. none of these
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Answer: (b).dedifferentiation

55. Cell fusion method includes the preparation of large number of
a. plant cells stripped of their cell wall
b. single plant cell stripped of their cell wall
c. plant cells with cell wall
d. cells from different species
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Answer: (b).single plant cell stripped of their cell wall