51. Majority of the cereals are highly recalcitrant to Agrobacterium mediated transformation, and so direct transformation methods have been developed to transform such plants. Which of the following direct transformation methods is applicable to intact plant tissues?
52. Vincristine and vinblastine, two commercially important secondary metabolites from Catharanthus roseus, are examples of
53. Agrobacterium based transformation of protoplasts obtained from dicots is based on the fact that
54. Match the secondary metabolites (Group I) with the corresponding plant species (Group II).
Group I
Group II
P. Morphine
1. Datura stramonium
Q. Pyrethrins
2. Catharanthus roseus
R. Scopolamine
3. Papaver somniferum
S. Vincristine
4. Tagetes erecta
| Group I | Group II |
| P. Morphine | 1. Datura stramonium |
| Q. Pyrethrins | 2. Catharanthus roseus |
| R. Scopolamine | 3. Papaver somniferum |
| S. Vincristine | 4. Tagetes erecta |
55. Hydrated synthetic seeds which are produced by ion exchange reaction involve mixing the somatic embryos in a solution of
56. Determine the correctness or otherwise of the following Assertion (A) and the Reason (R).
Assertion: Somatic embryogenesis in plants is a twostep process comprising of embryo initiation followed by embryo production.
Reason: Embryo initiation is independent of the presence of 2, 4-dichlorophenoxyacetic acid, whereas embryo production requires a high concentration of 2, 4-dichlorophenoxyacetic acid.
Assertion: Somatic embryogenesis in plants is a twostep process comprising of embryo initiation followed by embryo production.
Reason: Embryo initiation is independent of the presence of 2, 4-dichlorophenoxyacetic acid, whereas embryo production requires a high concentration of 2, 4-dichlorophenoxyacetic acid.
57. Which of the following statements are true about glyphosate tolerant transgenic plants?
P. Transgenic plants detoxify glyphosate.
Q. Transgenic plants produce an altered enzyme that is not affected by glyphosate.
R. Transgenic plants sequester glyphosate in vacuoles.
S. Transgenic plants overcome the inhibition of aromatic amino acid biosynthesis.
P. Transgenic plants detoxify glyphosate.
Q. Transgenic plants produce an altered enzyme that is not affected by glyphosate.
R. Transgenic plants sequester glyphosate in vacuoles.
S. Transgenic plants overcome the inhibition of aromatic amino acid biosynthesis.