PolyLearning

46. Organogenesis is
a. formation of callus tissue
b. formation of root and shoots on callus tissue
c. both (a) and (b)
d. genesis of organs
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Answer: (b).formation of root and shoots on callus tissue

47. Which of the following is used in the culture of regenerating protoplasts, single cells or very dilute cell suspensions?
a. Nurse medium
b. Nurse or feeder culture
c. Both (a) and (b)
d. None of these
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Answer: (c).Both (a) and (b)

48. In a callus culture
a. increasing level of cytokinin to a callus induces shoot formation and increasing level of auxin promote root formation
b. increasing level of auxin to a callus induces shoot formation and increasing level of cytokinin promote root formation
c. auxins and cytokinins are not required
d. only auxin is required for root and shoot formation
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Answer: (a).increasing level of cytokinin to a callus induces shoot formation and increasing level of auxin promote root formation

49. Protoplasts are the cells devoid of
a. cell membrane
b. cell wall
c. both cell wall and cell membrane
d. none of these
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Answer: (b).cell wall

50. Which breeding method uses a chemical to strip the cell wall of plant cells of two sexually incompatible species?
a. Mass selection
b. Protoplast fusion
c. Transformation
d. Transpiration
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Answer: (b).Protoplast fusion