8. Silver thiosulphate is added to culture medium as it helps to
A.maintain the pH
B.remove toxic phenolics from plant cells
C.prevent the gaseous plant hormone, ethylene dioxide from accumulating to detrimental condition.
D.all of the above

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9. In plant cell culture media, auxins and cytokinins are used in the range of
A.l-50μM
B.50-100μM
C.100-125μM
D.more than 125μM

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10. Concentration of sucrose generally used in plant cell culture media is
A.10-15 g/l
B.20-30 g/l
C.40-50 g/l
D.60-70 g/l

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11. 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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12.  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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13. To maintain the pH of the culture
A.organic acid such as citric, fumaric, malic and succinic acid is used
B.synthetic buffers such as Tris, MES or HEPS are used
C.both (a) and (b)
D.ammonium salts are used

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14. Which of the following is not a cytokinin?
A.2,4-dichlorophenoxyacetic acid
B.6 benzylaminopurine
C.Zeatin
D.Kinetin

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