| 71. | What is 'nurse' or conditioned medium? |
| a. | It is the media full of growth factors used for the growth of cells |
| b. | It is the medium added to nurse the callus culture |
| c. | Both (a) and (b) |
| d. | It is the liquid medium removed from the suspension of fast growing cells |
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Answer: (d).It is the liquid medium removed from the suspension of fast growing cells
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| 72. | What are the macronutrients used in plant cell culture medium? |
| a. | N, P, K, S, Na |
| b. | N, P, K, Ca, Cl |
| c. | N, P, K, S, Ca |
| d. | N, P, Ca, Na, Cl |
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Answer: (c).N, P, K, S, Ca
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| 73. | Neutralized activated charcoal is occasionally added to young regenerating cultures to |
| a. | remove toxic phenolics produced by the stressed plant cell |
| b. | help to remove plants growth regulators introduced at an earlier stage |
| c. | both (a) and (b) |
| d. | maintain the pH of the medium |
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Answer: (c).both (a) and (b)
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| 74. | Which is the most common carbon source used in the plant cell culture media? |
| a. | Sucrose |
| b. | Glucose |
| c. | Fructose |
| d. | Maltose |
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Answer: (a).Sucrose
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| 75. | Which of the following is an ethylene biosynthesis inhibitor? |
| a. | Citric acid |
| b. | Succinic acid |
| c. | Activated charcoal |
| d. | Silver thiosulphate |
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Answer: (d).Silver thiosulphate
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