41. Callus is yellow due to synthesis of ______ pigments
A. carotenoid.
B. anthocyanin.
C. chlorophyll.
D. phycocyanin.
ANSWER: A
42. . Callus is purple due to accumulation of ____________.
A. carotenoid.
B. anthocyanin.
C. chlorophyll.
D. phycocyanin.
ANSWER: B
43. Gene silencing is generally termed as __________ of genes.
A. switching off.
B. switching on.
C. absence.
D. presence.
ANSWER: A
44. Production of ethylene is inhibited by antisense gene________.
A. glyphoshate.
B. ACC synthase.
C. ACC synthatase.
D. lyase.
ANSWER: B
45. ____________ is responsible for fruit ripening.
A. Glyphoshate.
B. ACC synthase.
C. ACC synthatase.
D. Polygalacturonidase.
ANSWER: D
46. Preservation of germplasm in the frozen state is termed as _______.
A. cryoprectectant.
B. cryopreservation.
C. preservation.
D. storage.
ANSWER: B
47. Conversion of molecular nitrogen into nitrogenous compound is called as _______.
A. nitrogen fixation.
B. nitrogen adsorption.
C. nitrogen dissociation.
D. nitrogen absorption.
ANSWER: A
48. ________ fixes molecular nitrogen in the roots of leguminous plant.
A. Rhizobium species.
B. Bacillus species.
C. Clostridium species.
D. Staphylococcus species.
ANSWER: A
49. Rizobium is a Gram ______ bacterium
A. negative rod.
B. negative spherical.
C. positive rod.
D. positive spherical.
ANSWER: A
50. Nodule bacteria were isolated by _______.
A. Watson.
B. Crick.
C. Nitesh.
D. Beijernck.
ANSWER: D
