E-PolyLearning

61. Which of the following is considered as the disadvantage of conventional plant tissue culture for clonal propagation?
a. Multiplication of sexually derived sterile hybrids
b. Less multiplication of disease free plants
c. Storage and transportation of propogates
d. Both (b) and (c)
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Answer: (c).Storage and transportation of propogates

62. What is meant by 'Organ culture' ?
a. Maintenance alive of a whole organ, after removal from the organism by partial immersion in a nutrient fluid
b. Introduction of a new organ in an animal body with a view to create genetic mutation in the progenies of that animal
c. Cultivation of organs in a laboratory through the synthesis of tissues
d. The aspects of culture in community which are mainly dedicated by the need of a specified organ of the human body
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Answer: (a).Maintenance alive of a whole organ, after removal from the organism by partial immersion in a nutrient fluid

63. Which method of plant propagation involves the use of girdling?
a. Grafting
b. Cuttings
c. Layering
d. Micropropagation
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Answer: (c).Layering

64. Which is/are the naturally occurring plant auxins?
a. Indole acetic acid (IAA)
b. Naphthalenacetic acid (NAA)
c. 2,4-dichlorophenoxyacetic acid
d. All of the above
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Answer: (a).Indole acetic acid (IAA)

65. Which is/are the disadvantage/(s) of using IAA in plant cell culture media?
a. It is unstable in solution
b. Gets easily oxidized
c. Conjugated to inactive form by plant cells
d. All of the above
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Answer: (d).All of the above