61. Biofertilizers which converts nitrogen into nitrogenous compound are called as ________ fixers
A. dinitrogen.
B. nitrogen.
C. ammonia.
D. nitric acid.
ANSWER: B
62. Which one of the following is considered to be the best nitrogen fixers for biofertilizers?
A. Anabena.
B. Azomonas.
C. Rhizobium.
D. Azospirillum.
ANSWER: A
63. who reported the suspension cultures from carrot root explant?
A. Watson and Crick.
B. Steward and Shantz.
C. Benthaman and Hook.
D. Lederber and Tatum.
ANSWER: B
64. Which bacteria are known as natural genetic engineer of plants?
A. Agrobacterium tumefaciens.
B. E.coli.
C. Bacillus sp.
D. Streptomyces sp.
ANSWER: A
65. Who coined the term plasmid?
A. Herbert Boyer.
B. Lederberg.
C. Stanley.
D. Benthem.
ANSWER: B
66. The production of adventitious roots and shoots from cells of tissue culture is termed __________.
A. organogenesis.
B. micropropagation.
C. callus culture.
D. suspension culture.
ANSWER: A
67. The developmental pathway of numerous well organized small embryoids is called as _________.
A. organogenesis.
B. micropropagation.
C. somatic embryogenesis.
D. suspension culture.
ANSWER: C
68. The zygote embryo enclosed by protective coat developed from integument is __________.
A. artificial seeds.
B. embryo.
C. anther.
D. pollen.
ANSWER: A
69. Which one of the following is CORRECT regarding artificial seeds?
A. Establishment of callus culture.
B. Maturation of somatic embryos.
C. Encapsulation of somatic embryos.
D. All the above.
ANSWER: D
70. Artificial seeds help to study the role of ________.
A. endocarp.
B. endosperm.
C. pericarp.
D. mesocarp.
ANSWER: B
